Search for a multi-Higgs-boson cascade in WWbb events with the ATLAS detector in pp collisions at sqrt(s) = 8 TeV
EEUROPEAN ORGANISATION FOR NUCLEAR RESEARCH (CERN)
CERN-PH-EP-2013-173
Submitted to: PRD
Search for a multi-Higgs-boson cascade in W + W − b ¯ b eventswith the ATLAS detector in pp collisions at √ s = 8 TeV
The ATLAS Collaboration
Abstract
A search is presented for new particles in an extension to the Standard Model that includes a heavyHiggs boson ( H ), an intermediate charged Higgs boson pair ( H ± ), and a light Higgs boson ( h ). Theanalysis searches for events involving the production of a single heavy neutral Higgs boson whichdecays to the charged Higgs boson and a W boson, where the charged Higgs boson subsequentlydecays into a W boson and the lightest neutral Higgs boson decaying to a bottom–antibottom-quarkpair. Such a cascade results in a W -boson pair and a bottom–antibottom-quark pair in the final state.Events with exactly one lepton, missing transverse momentum, and at least four jets are selectedfrom a data sample corresponding to an integrated luminosity of 20.3 fb − , collected by the ATLASdetector in proton–proton collisions at √ s = 8 TeV at the LHC. The data are found to be consistentwith Standard Model predictions, and 95% confidence-level upper limits are set on the product ofcross section and branching ratio. These limits range from 0.065 pb to 43 pb as a function of H and H ± masses, with m h fixed at 125 GeV. a r X i v : . [ h e p - e x ] D ec earch for a multi-Higgs-boson cascade in W + W − b ¯ b eventswith the ATLAS detector in pp collisions at √ s = 8 TeV The ATLAS Collaboration
A search is presented for new particles in an extension to the Standard Model that includes aheavy Higgs boson ( H ), an intermediate charged Higgs boson pair ( H ± ), and a light Higgs boson( h ). The analysis searches for events involving the production of a single heavy neutral Higgsboson which decays to the charged Higgs boson and a W boson, where the charged Higgs bosonsubsequently decays into a W boson and the lightest neutral Higgs boson decaying to a bottom–antibottom-quark pair. Such a cascade results in a W -boson pair and a bottom–antibottom-quarkpair in the final state. Events with exactly one lepton, missing transverse momentum, and at leastfour jets are selected from a data sample corresponding to an integrated luminosity of 20.3 fb − ,collected by the ATLAS detector in proton–proton collisions at √ s = 8 TeV at the LHC. The dataare found to be consistent with Standard Model predictions, and 95% confidence-level upper limitsare set on the product of cross section and branching ratio. These limits range from 0.065 pb to 43pb as a function of H and H ± masses, with m h fixed at 125 GeV. PACS numbers: 12.60.-i, 13.85.Rm, 14.80.-j
I. INTRODUCTION
Recently, a Higgs boson has been discovered by theATLAS [1] and CMS [2] collaborations with a mass ofapproximately 125 GeV. This observation has been sup-ported by complementary evidence from the CDF and D0collaborations [3]. The study of such a boson, responsi-ble for breaking electroweak symmetry in the StandardModel (SM), is one of the major objectives of experimen-tal high-energy physics. A vital question is whether thisstate is in fact the Higgs boson of the SM, or part of anextended Higgs sector (such as that of the minimal super-symmetric Standard Model, MSSM [4, 5]), a compositeHiggs boson [6], or a completely different particle withHiggs-like couplings (such as a radion in warped extradimensions [7, 8] or a dilaton [9]).This Letter reports a search for particles in an exten-sion to the SM that includes heavier Higgs bosons inaddition to a light neutral Higgs boson, h , with mass m h = 125 GeV. Rather than assuming a particular the-oretical model, this analysis follows a simplified modelapproach by searching for a specific multi-Higgs-bosoncascade topology [10]. Many beyond-the-SM Higgs mod-els introduce a second Higgs doublet. In addition to the h , such models contain a heavy charged Higgs bosonpair H ± and a heavier neutral state H . An additionalpseudoscalar particle, A , may also exist within the TwoHiggs-Doublet Model (2HDM) [11] framework, but thisanalysis assumes it to be too heavy to participate in thecascade decay considered here.This letter reports the first search at the LHC for newparticles in the final state W ± W ∓ b ¯ b , via the process gg → H followed by the cascade, H → W ∓ H ± → W ∓ W ± h → W ∓ W ± b ¯ b , as illustrated in Fig. 1. Otherproduction modes, such as associated production orvector-boson fusion lead to different final states and arenot considered here. The W ± W ∓ b ¯ b final state also ap-pears in top-quark pair production. In this search, one of the W bosons is assumed to decay to hadrons lead-ing to jets and the other one decays to an electron plusa neutrino ( e +jets) or a muon plus a neutrino ( µ +jets).The same final state has been used by CDF in a simi-lar search for Higgs-boson cascades [12]. Other relatedsearches have been performed for charged Higgs bosonsin top-quark decays t → H + b [13–18]. Boosted decisiontrees (BDTs) are used to distinguish the Higgs-boson cas-cade events from the predominantly t ¯ t background. b ¯ bWWgg H H ± h FIG. 1: Diagram showing the Higgs-boson cascade gg → H → W ∓ H ± → W ∓ W ± h → W ∓ W ± b ¯ b . II. ATLAS DETECTOR AND DATA SAMPLE
The ATLAS experiment [19] at the LHC is a multi-purpose particle physics detector with approximatelyforward-backward symmetric cylindrical geometry [20].It consists of an inner tracking detector surrounded bya thin superconducting solenoid, electromagnetic andhadronic calorimeters, and a muon spectrometer incor-porating three large superconducting toroid magnet as-semblies.The data used in this analysis were collected during2012 from pp collisions at a centre-of-mass energy of 8TeV using triggers designed to select high transverse mo-mentum ( p T [20]) electrons or muons. The data samplecorresponds to an integrated luminosity of 20.3 fb − . III. SIGNAL AND BACKGROUNDSIMULATION
The production of H bosons via gluon fusion with m H = 325–1025 GeV and subsequent decays H → W ∓ H ± with m H ± = 225–925 GeV and H ± → W ± h with m h = 125 GeV, is modelled using the MAD-GRAPH [21] Monte Carlo (MC) event generator withan effective vertex to model the fermion loop and anarrow natural width of 50 MeV. Additional radiation,hadronization, and showering are described by PYTHIAv6.4 [22]. Thirty-six different mass pairs are tested forthe Higgs-boson cascade signal within the above m H ± and m H mass ranges.The dominant SM background to this signature is top-quark pair production. This background is modelledusing simulated events from the MC@NLO v4.01 [23]event generator with the CT10 [24] parton distributionfunctions (PDFs). The parton shower and the under-lying event simulation are performed with
HERWIG v6.520 [25] and
JIMMY v4.31 [26], respectively, usingthe AUET2 tune [27]. The t ¯ t cross section for pp col-lisions at a centre-of-mass energy of √ s = 8 TeV is as-sumed to be σ t ¯ t = 253 +13 − pb for a top-quark mass of172 . α s uncertain-ties are calculated using the PDF4LHC prescription [34]with the 68% confidence level (C.L.) of the MSTW2008NNLO [35, 36], CT10 NNLO [24, 37] and NNPDF2.35f FFN [38] PDF sets, added in quadrature to ob-tain the normalization and factorization scale uncertain-ties. Additional t ¯ t samples used to estimate varioussystematic effects are generated with POWHEG [39–41] interfaced to
HERWIG / JIMMY , POWHEG inter-faced to
PYTHIA , and
AcerMC v3.8 [42] interfaced to
PYTHIA . The t ¯ t modelling is also checked with samplesgenerated by ALPGEN [43] interfaced with
HERWIG .Other backgrounds are expected to originate fromvector-boson production with associated jets ( W -boson+jets and Z -boson /γ ∗ +jets), as well as single top-quark, diboson ( W W , W Z , ZZ ), and multi-jet produc-tion. All background predictions, except that for multi-jet production, are obtained from simulated events.The W/Z -boson+jets contribution is simulated using
ALPGEN interfaced to
HERWIG / JIMMY , and is nor-malized to NNLO theoretical cross sections [44, 45]. Thecontribution from single top-quark production is simu-lated using
MC@NLO interfaced to
HERWIG / JIMMY for the s -channel top-quark production and W t produc- tion, and with
AcerMC interfaced to
PYTHIA for the t -channel, and normalized to approximate NNLO theo-retical cross sections [46–48]. Finally, diboson productionis simulated with HERWIG and normalized to NLO the-oretical cross sections [49].All generated events are passed through the detailedATLAS detector simulation [50] based on
GEANT4 [51],with the exception of the additional samples used to ac-count for systematic effects in t ¯ t production, for which aparameterized simulation [50] of the calorimeter responseis used. The events are then processed with the samereconstruction software as the data. MC events are over-laid with additional minimum bias events generated with PYTHIA to simulate the effect of pile-up (additional pp interactions in either the same or closeby bunch cross-ings as the primary interaction); the number of overlaidproton–proton interactions is chosen to match the distri-bution of the number of additional interactions observedin the data.Multi-jet production may mimic the presence of a lep-ton, but the contribution from these processes is foundto be small. It is estimated from the data by the ma-trix method [52] in the µ +jets and e +jets channels. Thematrix method is a technique to estimate the numberof events with a fake, isolated lepton in the signal se-lection, and uses loose and tight isolation definitions forleptons. The tight isolation definitions are those used inthis analysis, and tight leptons are a subset of the looseleptons. In a selection dominated by real leptons, theefficiency ( (cid:15) real ) of a loose lepton to also pass the tightisolation requirements is measured. The rate ( (cid:15) fake ) ofloose leptons passing the tight requirements is measuredin a multi-jet-dominated selection. These rates, (cid:15) real and (cid:15) fake , are used to estimate the multi-jet contribution tothe analysis selection. IV. EVENT SELECTION
This analysis relies on the measurement of jets, elec-trons, muons and the missing transverse momentum( E missT ) [53]. Since this analysis investigates a final statedominated by top-quark pair production, a selection sim-ilar to the top-quark cross-section measurement by theATLAS collaboration [54] is used.Jets are reconstructed using the anti- k t algorithm [55]with a radius parameter R = 0 .
4, and are calibratedat the energy cluster level [56] to compensate for differ-ing calorimeter response to hadronic and electromagneticshowers. A correction for pile-up is applied to the jet en-ergy [57]. Jets are required to have p T >
25 GeV and | η | < pp interactions are sup-pressed by requiring the jet vertex fraction (JVF) to belarger than 0.5 for jets with p T <
50 GeV and | η | < [GeV] bb m F r a c t i on o f e v en t s / G e V ATLAS = 8 TeVs
Simulation = 125 GeV h m = 325 GeV – H m = 525 GeV H m = 125 GeV h m = 525 GeV – H m = 825 GeV H m = 125 GeV h m = 725 GeV – H m = 1025 GeV H m [GeV] Wbb m
200 300 400 500 600 700 800 900 1000 F r a c t i on o f e v en t s / G e V ATLAS = 8 TeVs
Simulation [GeV]
WWbb m
400 600 800 1000 1200 1400 F r a c t i on o f e v en t s / G e V ATLAS = 8 TeVs
Simulation
FIG. 2: Distributions of reconstructed masses in simulation for the three Higgs bosons in the cascade; the lightest Higgs boson, h (left, as m b ¯ b ), the charged Higgs boson, H ± (middle, as m b ¯ bW ), and the heavy Higgs boson, H (right, as m b ¯ bWW ), shownfor three example mass hypotheses. with the largest (cid:80) p T of associated tracks. Jets are b -tagged (identified as the product of a b -quark) using theMV1 tagger [58], which combines several tagging algo-rithms [59] using an artificial neural network. A 70% tag-ging efficiency is achieved in identifying b -jets with p T >
20 GeV and | η | < t ¯ t events, while thelight-jet rejection factor is 130. Additional correctionsto the tagging efficiency and mistagging rate are derivedfrom data and applied to all simulated samples [58, 60–62].Electrons are identified [63] as energy clusters in theelectromagnetic calorimeter matched to reconstructedtracks in the inner detector. Selected electrons are re-quired to pass stringent selection requirements that pro-vide good discrimination between isolated electrons andjets. Isolation requirements are imposed in cones ofcalorimeter energy deposits (∆ R ( e, deposit) < .
2) andinner-detector tracks (∆ R ( e, track) < .
3) around theelectrons direction where ∆ R = (cid:112) (∆ η ) + (∆ φ ) . Thecalorimeter isolation is corrected for leakage of the en-ergy of the electron into the isolation cone and for en-ergy deposits from pile-up events. Both the calorimeterand the inner detector isolation requirements are chosento give 90% efficiency. Selected electrons are required tohave transverse momentum p T >
25 GeV and pseudora-pidity in the range | η | < .
47, excluding the calorimeterbarrel/end-cap transition region 1 . < | η | < . p T >
25 GeV and | η | < .
5. The isolation variable [65, 66] for muons isdefined as I µ = (cid:80) p track T /p µ T , where the sum runs overall tracks (except the one matched to the muon) thatpass quality requirements and have p track T > R ( µ, track ) <
10 GeV /p µ T . Muons with I µ < R ( e, jet) < R ( e, jet) < R ( µ, jet) < p T thresholds of 24 GeV or 36 GeV for muons and 24 GeVor 60 GeV for electrons (the lower momentum triggersalso apply isolation requirements). Events are required tohave exactly one reconstructed isolated electron or muonmatching the corresponding trigger object and a primaryvertex reconstructed from at least five tracks, each with p T >
400 MeV. At least four jets with p T >
25 GeVand | η | < . b -jets. Additional requirements to reducethe multi-jet background are applied: • in the e +jets channel: E missT >
30 GeV and m WT >
30 GeV, • in the µ +jets channel: E missT >
20 GeV and m WT + E missT >
60 GeV.The transverse W -boson mass is defined as m WT = (cid:113) p (cid:96) T p ν T (1 − cos( φ (cid:96) − φ ν )), where p T is thetransverse momentum, φ is the azimuthal angle, and (cid:96) and ν refer to the charged lepton and the neutrino,respectively. Different requirements are used for themuon and electron channels due to different levelsof multi-jet background contamination. The signalpre-region (SPR) is defined to contain events that passthese requirements. Table I illustrates the expectedyields of the background and the observed number ofevents in this region. V. EVENT RECONSTRUCTION ANDMULTIVARIATE ANALYSISA. Event Reconstruction
The Higgs-boson cascade event reconstruction beginswith identification of the leptonically decaying W boson.It is assumed that the missing transverse momentum isdue to the resulting neutrino. The neutrino pseudorapid-ity is set to the value which results in an invariant mass ofthe lepton and neutrino closest to the nominal W -bosonmass [67]; in the case of degenerate solutions, the small-est magnitude of pseudorapidity is chosen. Next, the two b -tagged jets are used to reconstruct the lightest Higgs-boson candidate, h ; if there are more than two b -taggedjets, the two jets with the highest b -tagging scores [58] areused. The hadronically decaying W boson is identifiedfrom the remaining jets as the pair with reconstructeddijet mass closest to the nominal W -boson mass. Thecharged Higgs-boson candidate H ± is constructed fromthe light h and the W -boson candidate which gives thelarger value of m H ± . The heavy neutral Higgs-bosoncandidate H is then formed as b ¯ bW W . Fig. 2 illustratesthe reconstructed mass distributions for the h , H ± , and H in simulation for selected mass values.Since the dominant background is top-quark pair pro-duction, the two b -quarks and two W bosons are com-bined in W b pairs to give top-quark candidates. Thecombination which minimizes the sum of the absolutevalue of their differences from the nominal top-quarkmass [67] for both pairs is chosen. The invariant massesof the top-quark candidates are useful to discriminate t ¯ t events from the Higgs-boson signal. The masses ( m t , m ¯ t )of the two top-quark candidates and the absolute valuesof their differences ( | m t − m ¯ t | ) are calculated. B. Multivariate Analysis
A multivariate analysis is performed to distinguishthe Higgs-boson cascade from t ¯ t events. Several re-constructed kinematic quantities, including the invariantmasses of the Higgs-boson candidates as described above,are used as inputs to a BDT classifier, provided in theTMVA [68] package. TMVA provides a ranking for theinput variables, which is derived by counting how oftenan input variable is used to split decision tree nodes, andby weighting each split occurrence by the square of thegain in signal-to-background separation it has achievedand by the number of events in that node. Several com-binations of input variables are tested in training theBDTs. The inputs for the BDTs are optimized for thebest expected cross-section limits while avoiding over-training, and the variable rankings of TMVA are used asheuristics in choosing the BDT inputs. Seven kinematicvariables are chosen to achieve the best expected resultacross the entire signal mass grid: • m b ¯ b , m b ¯ bW and m b ¯ bW W , as described above; • ∆ R ( b, ¯ b ), the angular distance between the pair of b -tagged jets used to reconstruct the light Higgs-boson candidate; • leptonic m t , the top-quark mass reconstructed us-ing the leptonically decaying W boson; • hadronic m t , the top-quark mass reconstructed us-ing the hadronically decaying W boson; • | m t − m ¯ t | .For cascades originating from a high-mass Higgs boson,the reconstructed top-quark masses along with m W W b ¯ b are the highest-ranked input variables. For the low-massHiggs-boson cascades, m b ¯ b and ∆ R ( b, ¯ b ) have the highestrank. Since the kinematics of the Higgs-boson cascadevary greatly with the masses of the heavy and interme-diate Higgs bosons, a different BDT is trained for eachsignal mass hypothesis.Only MC events that pass the SPR requirementsare used in the training of the BDTs. Each BDT isconstructed as a forest with 750 decision trees, andis trained against simulated background event samples.The stochastic gradient boosting method [68] is used toimprove classification accuracy and its robustness againststatistical fluctuations. Each BDT is checked for over-training with a statistically independent test sample.For each of the 36 signal mass points, a final thresh-old is chosen for its respective BDT output which givesthe best expected sensitivity, measured using the sameconfidence-level calculations as applied to the data anddescribed below. A counting experiment is then per-formed using events that pass those BDT output thresh-olds. In this way, the BDT thresholds divide the SPRinto 36 non-orthogonal signal regions, one for each signalmass point. VI. BACKGROUND VALIDATION INCONTROL REGIONS
The modelling of the SM backgrounds is validated inthree background-dominated control regions. The con-trol regions retain the requirements of one lepton and atleast four jets, and each region has additional require-ments. In control regions with fewer than two b -taggedjets, the two jets with the highest b -tagging scores areused to reconstruct the lightest Higgs boson, h . Thefollowing control regions are used: • Control Region 1 (CR1): at least four jets, exactlyone lepton and no b -tagged jets. This region vali-dates primarily the W -boson+jets modelling. Thisregion is background-enriched relative to the hypo-thetical signal due to the b -tag veto. [GeV] bb m
200 300 400 500 600 700 800 900 1000 E v en t s -1 L = 20.3 fb (cid:242)
Data ttW+jetsOther = 625 GeV – H m = 925 GeV H m Signal (0.05 pb) = 425 GeV – H m = 525 GeV H m Signal (1.00 pb)
ATLAS = 8 TeVs [GeV] bb m200 300 400 500 600 700 800 900 1000 ( D a t a - S M ) / S M -0.6-0.4-0.200.20.40.6 Uncertainty [GeV] bb m
200 300 400 500 600 700 800 900 1000 E v en t s -1 L = 20.3 fb (cid:242)
Data ttW+jetsOther = 625 GeV – H m = 925 GeV H m Signal (0.05 pb) = 425 GeV – H m = 525 GeV H m Signal (1.00 pb)
ATLAS = 8 TeVs [GeV] bb m200 300 400 500 600 700 800 900 1000 ( D a t a - S M ) / S M -0.6-0.4-0.200.20.40.6 Uncertainty
FIG. 3: Distributions of m b ¯ b with uncertainties in the con-trol regions CR1 (top) and CR2 (bottom). The data (blackpoints) are compared to the background model (stacked his-togram). In control regions with fewer than two b -tagged jets,the two jets with the highest b -tagging scores are used. Thefinal bin contains any overflow events. Two choices of signalhypotheses are also shown. • Control Region 2 (CR2): at least four jets, ex-actly one lepton and exactly one b -tagged jet. Thisregion validates primarily the modelling of the t ¯ t background. This background is fractionally larger,compared to a hypothetical signal, here than in thesignal region due to the b -tagging cut, which pref-erentially selects the higher p T b -quarks from top-quark decay. Although a potential signal wouldnot be absent in this control region, the differentlevels of signal and t ¯ t contributions allow a test of t ¯ t modelling by comparing levels of agreement be-tween data and prediction in the signal and CR2regions. • Control Region 3 (CR3): at least four jets, ex-actly one lepton, at least two b -tagged jets, and m b ¯ b >
150 GeV. This region focuses primarily onvalidation the modelling of the t ¯ t background withkinematics similar to the hypothetical signal, but TABLE I: Expected background contributions with their to-tal (systematic and statistical) uncertainties and the observednumber of events with exactly one lepton and at least fourjets, and in the SPR region, which additionally requires atleast two b -tagged jets. In the table, contributions from pro-cesses with light-flavour (LF) u, d, s -quarks and heavy-flavour(HF) c, b -quarks are distinguished.Source e/µ + ≥ t ¯ t . +3 . − . · . +2 . − . · W -boson + jets LF 16 . +8 . − . · . +4 . − . · W -boson + jets HF 8 . +4 . − . · . +2 . − . · Z -boson + jets LF 26 . +6 . − . · . +8 . − . · Z -boson + jets HF 4 . +1 . − . · . +1 . − . · Single top-quark 16 . +2 . − . · . +7 . − . · W W, W Z, ZZ . +5 . − . · . +1 . − . · Fake leptons 1 . +1 . − . · . +8 . − . · Total 68 . +14 . − . · . +2 . − . · Observed 664876 151123 is background-enriched due to the m b ¯ b >
150 GeVrequirement.Figs. 3 and 4 illustrate the modelling of the Higgs-boson mass reconstruction in CR1, CR2 and CR3. Thedata and simulation agree within total uncertainties overthe entire phase space. This is important, as the BDTmay utilize any part of this phase space to build a pow-erful discriminant. In addition, the BDT output in eachof the three control regions is compared to the predictedoutput and found to agree within statistical and system-atic uncertainties.
VII. SYSTEMATIC UNCERTAINTIES
Several sources of systematic uncertainties are relevantto this analysis.Instrumental systematic uncertainties are related tothe reconstruction of physics objects. For jets, system-atic uncertainties on the jet energy scale, energy resolu-tion, and reconstruction efficiency are included. For lep-tons, the systematic uncertainties from the momentumor energy scale and resolution, trigger efficiency, recon-struction, and identification efficiency are incorporated.Systematic uncertainties related to the performances ofthe b -tagging and JVF requirements are also included.Due to the presence of multiple ( ≥
4) jets and thedominant t ¯ t background (roughly 90% in the signal re-gion), significant systematic uncertainties are associatedwith jets and the modelling of the t ¯ t background. Ta-ble II lists the impact of these uncertainties on the back-ground estimates and signal efficiency for an example sig- [GeV] bb m
200 300 400 500 600 700 800 900 1000 E v en t s -1 L = 20.3 fb (cid:242)
Data ttW+jetsOther = 625 GeV – H m = 925 GeV H m Signal (0.05 pb) = 425 GeV – H m = 525 GeV H m Signal (1.00 pb)
ATLAS = 8 TeVs [GeV] bb m200 300 400 500 600 700 800 900 1000 ( D a t a - S M ) / S M -0.6-0.4-0.200.20.40.6 Uncertainty [GeV]
WWbb m E v en t s -1 L = 20.3 fb (cid:242)
Data ttW+jetsOther = 625 GeV – H m = 925 GeV H m Signal (0.05 pb) = 425 GeV – H m = 525 GeV H m Signal (1.00 pb)
ATLAS = 8 TeVs [GeV]
WWbb m0 200 400 600 800 1000 1200 1400 1600 1800 ( D a t a - S M ) / S M -0.6-0.4-0.200.20.40.6 Uncertainty
FIG. 4: Distributions of m b ¯ b (top) and m b ¯ bWW (bottom) withuncertainties in the control region CR3. The data (blackpoints) are compared to the background model (stacked his-togram). The final bin contains any overflow events. Twochoices of signal hypotheses are also shown. nal region given by the BDT threshold for a signal with m H , m H ± = 425 ,
225 GeV.Several sources of uncertainty on the jet energy scalecalibration are considered, such as uncertainties dueto pile-up and the light-quark and gluon composition.These sources are added in quadrature and listed as onesystematic uncertainty in Table II. As a further uncer-tainty, the jet energy is smeared to cover any disagree-ments in the jet energy resolution measured in data andin simulated event samples. A jet reconstruction ef-ficiency [69] systematic uncertainty is applied by ran-domly discarding a fraction of low- p T jets in the simu-lated events. The jet b -tagging efficiencies are evaluatedin data and MC [58]. The difference is corrected with ascale factor, the uncertainty of which is treated as a sys-tematic uncertainty. A small discrepancy in the efficiencyof the JVF requirement has been observed between dataand MC simulation. The JVF requirement is varied tocover this observed discrepancy, and the resulting changein the expected background is taken as a systematic un-certainty. Uncertainty Background SignalYields (%) Efficiency (%) m H = 425 GeV m H ± = 225 GeV Jet vertex fraction ± ± b -tagging eff. ± ± ± ± ± ± ± < ± < µ momentum ± < ± < e energy ± < ± < ± < ± ± ± ± < ± < W -boson+jets shape ± < ± < ± t ¯ t modelling ± ± ± ± ± ± m H , m H ± = 425, 225 GeV. The signal region for this mass point isdefined as the events that pass the BDT threshold for thismass sample. The positive and negative relative shifts havebeen averaged for compactness. Systematic uncertainties associated with leptons arefound to have a small effect, typically less than 1% rel-ative to background estimates and signal efficiency. Formuons, the uncertainty in the momentum scale and res-olution is accounted for. For electrons, the uncertaintiesin the energy scale and resolution are included. For bothleptons, uncertainties on the trigger, identification, andreconstruction efficiencies are incorporated.The uncertainty due to the modelling of initial- andfinal-state quark and gluon radiation (ISR/FSR) is esti-mated using t ¯ t events produced with the AcerMC gen-erator interfaced with
PYTHIA , where the parameterscontrolling ISR/FSR are varied in a range suggested bythe data in the analysis of Ref. [70]. For the signal, eventsgenerated with varied ISR/FSR parameters in
PYTHIA are compared to the nominal simulation; the differencesin background yields and signal efficiency estimates aretaken as a systematic uncertainty.The systematic uncertainty due to the modelling of t ¯ t production is estimated by comparing results ob-tained with MC@NLO , POWHEG , and
ALPGEN sig-nal samples. An uncertainty due to the theoretical t ¯ t cross section [71] is applied to the overall t ¯ t normaliza-tion. Since this is the dominant background the effect onthe total background uncertainty is substantial (about5% relative to the background estimate); the total nor-malization uncertainty on the background is 5.5%.Since non- t ¯ t processes account for less than 10% of thebackground in the signal region, systematic uncertaintiesassociated with them are found to have a small impacton the overall background uncertainty. The systematicuncertainty related to the modelling of W -boson+jets isdetermined by varying the parameterization of the renor-malization and factorization scales in ALPGEN . As de-fault, both scales are set to ( m W + ( p W T ) ) and this isvaried by factors of two and by changing the form to( m W + (cid:80) jets p ). This systematic uncertainty is foundto be small ( < W -boson + jets estimate due to uncertaintiesin the the cross section, with an additional 24% per jetadded in quadrature due to the uncertainty in Berendsscaling [72]. This results in a 48% uncertainty for eventswith four jets, contributing to the overal 5.5% uncer-tainty on the background normalization.The systematic uncertainty due to single top-quark,diboson, and Z -boson+jets production is evaluated byvarying their cross sections within their uncertainties asdescribed in Ref. [52]. Since these contributions aresmall, the systematics associated with them are foundto be negligible ( < VIII. RESULTS
The yields in the signal regions are given in Table III.The observed yields are found to be consistent withSM background expectations, within uncertainties. TheBDT outputs for three example signal mass points areillustrated in Fig. 5.The 95% confidence-level production cross-section up-per limits for the various signal hypotheses are obtainedusing the CLs frequentist method [74], with the profilelikelihood ratio of the number of events that pass theBDT threshold as the test statistic [75] as implementedin Ref. [76]. Systematic uncertainties are treated as nui-sance parameters and the calculation uses the asymptoticapproximation [75]. Table III presents the signal efficien-cies, the total expected background and observed eventcounts for each signal case, as well as the expected andobserved limits with the local p -values. The p -values aredefined as the probabilities under the background-onlyhypothesis to observe these data or data which are moresignal-like. The p -values have a maximum possible valueof 0 .
5, which is the case when n < b , where b is the num-ber of events expected from the background model and n is the number of events observed in the data.Since the signal regions are correlated, background-only pseudo-experiments are used to estimate the ex-pected distribution of the p -values in all the signal re-gions, accounting for the correlations. The observed dis-tribution of p -values is found to be consistent with theexpectation from pseudo-experiments. The expected andobserved limits as a function of the H and H ± massesare illustrated in Fig. 6. The limits are the weakest inlow Higgs-boson mass regions due to the poorer separa- = 1025, 225 GeV – H , m H Trained for m
BDT output -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 E v en t s -1 L = 20.3 fb (cid:242)
Data ttW+jetsOtherBDT threshold = 225 GeV – H m = 1025 GeV H m Signal (1.00 pb)
ATLAS = 8 TeVs = 1025, 225 GeV – H , m H Trained for m
BDT output-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 ( D a t a - S M ) / S M -0.6-0.4-0.200.20.40.6 Uncertainty = 625, 325 GeV – H , m H Trained for m
BDT output -1 -0.95 -0.9 -0.85 -0.8 -0.75 -0.7 -0.65 -0.6 E v en t s -1 L = 20.3 fb (cid:242)
Data ttW+jetsOtherBDT threshold = 325 GeV – H m = 625 GeV H m Signal (1.00 pb)
ATLAS = 8 TeVs = 625, 325 GeV – H , m H Trained for m
BDT output-1 -0.95 -0.9 -0.85 -0.8 -0.75 -0.7 -0.65 -0.6 ( D a t a - S M ) / S M -0.6-0.4-0.200.20.40.6 Uncertainty = 1025, 625 GeV – H , m H Trained for m
BDT output -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 E v en t s -1 L = 20.3 fb (cid:242)
Data ttW+jetsOtherBDT threshold = 625 GeV – H m = 1025 GeV H m Signal (1.00 pb)
ATLAS = 8 TeVs = 1025, 625 GeV – H , m H Trained for m
BDT output-1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 ( D a t a - S M ) / S M -0.6-0.4-0.200.20.40.6 Uncertainty
FIG. 5: Distribituions of the BDT output in the signal regionsfor three example signal mass points, m H , m H ± = 1025, 225GeV (top), m H , m H ± = 625, 325 GeV (middle), m H , m H ± = 1025, 625 GeV (bottom). Signal histograms have beenscaled to a production cross section of 1 pb. BDT thresholdsare shown as dashed lines for each mass point. The back-ground model is shown as the coloured stacked histogram.The final bin contains any overflow events. tion between t ¯ t and signal events.In order to facilitate the comparison of these resultswith those obtained by other experiments, the observedcross-section limits are compared to the predictions for Mass [GeV] H
400 500 600 700 800 900 1000 M a ss [ G e V ] – H E x pe c t ed L i m i t s [ pb ] -1 -1 Ldt = 20.3 fb (cid:242)
ATLAS = 8 TeVs – W – Wbb fi – W – W h fi – H – W fi H Mass [GeV] H
400 500 600 700 800 900 1000 M a ss [ G e V ] – H % C . L . U ppe r L i m i t s [ pb ] -1 -1 Ldt = 20.3 fb (cid:242)
ATLAS = 8 TeVs – W – Wbb fi – W – W h fi – H – W fi H Mass [GeV] H
400 500 600 700 800 900 1000 M a ss [ G e V ] – H ) H fi ( gg s % C . L . U ppe r L i m i t s / -1 -1 Ldt = 20.3 fb (cid:242)
ATLAS = 8 TeVs – W – Wbb fi – W – W h fi – H – W fi H FIG. 6: The expected (top) and observed (middle) 95% C.L.upper limits on the cross section for gg → H → W ∓ H ± → W ± W ∓ h → W ± W ∓ b ¯ b as a function of m H and m H ± . Theratio (bottom) of the observed 95% C.L. upper limits on thecross section to the theoretical cross section for a heavy Higgsboson produced via gluon-gluon fusion at the SM rate. a heavy Higgs boson with SM-like gg -fusion production(Fig. 6). The theoretical production cross section of aheavy SM-like Higgs boson (only gluon fusion is con-sidered) is calculated in the complex-pole scheme us-ing the dFG [77] program, to next-to-next-to-leadingorder (NNLO) in QCD. Next-to-leading order (NLO)electroweak (EW) corrections are also applied, as wellas QCD soft-gluon resummations up to next-to-next-to-leading log (NNLL).Using this benchmark, the cross- section upper limits observed are greater than the theo-retical cross sections of the heavy Higgs boson, H , forall mass points tested. Therefore, the current limits arenot stringent enough to exclude models with SM-like pro-duction rates even with 100% branching ratios for both H → H ± W ± and H ± → h W ± and SM values forBR( h → b ¯ b ). The limits are most stringent in the high H and H ± mass regions, where the ratio of the limits tothe theoretical cross section is nearly unity. This searchproduces tighter bounds than those obtained by the CDFcollaboration [12].Additionally, the results of this search are interpret-ted in the context of a heavy CP-even Higgs boson of atype-II 2-Higgs-Doublet Model [78] produced via gluonfusion. This model has seven free parameters: the massof the CP-even Higgs bosons ( m h and m H ), the mass ofthe CP-odd Higgs boson ( m A ), the mass of the chargedscalar ( m H ± ), the mixing angle between the CP-evenHiggs bosons ( α ), the ratio of the vacuum expectationvalues of the two Higgs doublets (tan β ), and the Z -symmetry soft-breaking-term coefficient of the Higgs po-tential ( M ). The parameter space of the type-II 2HDMis sampled for given values of m H and m H ± and as-suming m h = 125 GeV and sin( β − α ) ≥ .
99. Thelatter assumptions are made in order to maintain a SM-like Higgs boson with properties similar to those ob-served at the LHC. The gluon-fusion production crosssection is calculated with SusHi [79] at NNLO precisionin QCD corrections, and the branching ratio of the cas-cade H → W ∓ H ± → W + W − h → W + W − b ¯ b with2HDMC [80]. Only parameter space points that satisfytheory constraints are considered. The theory constraintsinclude Higgs-potential stability, tree-level unitarity forHiggs-boson scattering [81], and the perturbative natureof the quartic Higgs-boson couplings, as these are imple-mented in 2HDMC. The type-II 2HDM phase space isscanned with a million random points per ( m H , m H ± )pair. The majority of the spanned phase space violatesthe theoretical constraints mentioned above. The pointswith the lowest cross section times branching fraction σ × BF(excluded) /σ × BF(theory) which satisfy the aboveconstraints are shown in Table IV, where σ is the crosssection and BF is the branching fraction. None are ex-cluded by the limits presented here.In conclusion, the first LHC search for a topology inwhich a heavy Higgs boson decays via a cascade of lightercharged and neutral Higgs bosons has been performedby the ATLAS experiment using data corresponding toan integrated luminosity of 20.3 fb − in pp collisions at √ s = 8 TeV. No significant excess of events above the ex-pectation from the SM background was found and limitson the production cross section have been set. TABLE III: Expected background and observed yield, with expected and observed cross-section upper limits for each signalhypothesis in their respective signal regions. For the expected cross-section limits, the uncertainties describe a range whichcontains the limits in 68% and 95% of simulated experiments, respectively. Also shown is the p -value for the background-onlyhypothesis. Masses [GeV] Yields Efficiency (%) Limits [pb] at 95% C.L. Backgr.-only m H m h ± t ¯ t Total Bkgd. Obs. Signal Expected Obs. p -value325 225 8 . +1 . − . · . +1 . − . · . +0 . − . +5+12 − − . +1 . − . · . +1 . − . · . +0 . − . +18+40 − − . +1 . − . · . +1 . − . · . +0 . − . +17+40 − −
39 0.49525 225 11 . +1 . − . · . +1 . − . · . +0 . − . +17+41 − − . +1 . − . · . +1 . − . · . +1 . − . +15+34 − − . +6 . − . · . +6 . − . · . +0 . − . +11+28 − − . +2 . − . · . +3 . − . · . +0 . − . +8+20 − − . +1 . − . · . +1 . − . · . +0 . − . +5+11 − −
11 0.49625 425 20 . +3 . − . · . +4 . − . · . +0 . − . . +2 . . − . − . . +3 . − . · . +4 . − . · . +0 . − . . +1 . . − . − . . +5 . − . · . +6 . − . · . +0 . − . . +1 . . − . − . . +5 . − . · . +7 . − . · . +0 . − . . +0 . . − . − . . +4 . − . · . +5 . − . · . +0 . − . . +0 . . − . − . . +2 . − . · . +3 . − . · . +0 . − . . +0 . . − . − . . +3 . − . · . +5 . − . · . +0 . − . . +0 . . − . − . . +0 . − . · . +1 . − . ·
830 1 . +0 . − . . +0 . . − . − . . +1 . − . · . +2 . − . · . +0 . − . . +0 . . − . − . . +1 . − . · . +2 . − . · . +0 . − . . +0 . . − . − . . +1 . − . · . +2 . − . ·
901 2 . +0 . − . . +0 . . − . − . . +0 . − . · . +1 . − . ·
696 2 . +0 . − . . +0 . . − . − . . +0 . − . · . +1 . − . ·
628 1 . +0 . − . . +0 . . − . − . . +0 . − . · . +1 . − . ·
641 2 . +0 . − . . +0 . . − . − . . +1 . − . · . +1 . − . ·
876 2 . +0 . − . . +0 . . − . − . . +1 . − . · . +1 . − . ·
796 3 . +0 . − . . +0 . . − . − . . +1 . − . · . +1 . − . ·
787 3 . +0 . − . . +0 . . − . − . . +0 . − . · . +0 . − . ·
185 2 . +0 . − . . +0 . . − . − . . +0 . − . · . +1 . − . ·
359 2 . +0 . − . . +0 . . − . − . . +0 . − . · . +1 . − . ·
537 3 . +1 . − . . +0 . . − . − . . +0 . − . · . +1 . − . ·
306 1 . +0 . − . . +0 . . − . − . . +1 . − . · . +2 . − . ·
839 3 . +0 . − . . +0 . . − . − . . +0 . − . · . +1 . − . ·
691 3 . +0 . − . . +0 . . − . − . . +0 . − . · . +1 . − . ·
297 3 +0 . − . . +0 . . − . − . . +0 . − . · . +1 . − . ·
477 3 . +1 . − . . +0 . . − . − . . +0 . − . · . +0 . − . ·
162 1 . +0 . − . . +0 . . − . − . . +0 . − . · . +0 . − . ·
241 2 . +0 . − . . +0 . . − . − . . +1 . − . ·
10 13 . +4 . − . ·
10 110 1 . +0 . − . . +0 . . − . − . TABLE IV: Interpretation of the results in some type-II 2HDM parameter space choices. For each value of m H , m H ± , whereat least one valid point is found, sample points in the space of the parameters (tan( β ), sin( β − α ), m A , and M ) which satisfypotential stability, unitarity and perturbativity constraints and give the smallest ratio of excluded to predicted cross sectionare shown. m H m H ± tan( β ) sin( β − α ) m A M σ ( H ) BF( H → h W + W − ) Excl/Pred[GeV] [GeV] [GeV] [TeV ] [pb]325 225 15 0.99 303 6.9 · −
28 0.222 2.1425 225 20 0.99 439 8.9 · − · −
10 0.288 14525 325 10 0.99 384 2.7 · − · − · − · − · − · − · − · − · − · − · − · − · − · − IX. ACKNOWLEDGEMENTS
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The ATLAS Collaboration
G. Aad , T. Abajyan , B. Abbott , J. Abdallah , S. Abdel Khalek , O. Abdinov , R. Aben , B. Abi ,M. Abolins , O.S. AbouZeid , H. Abramowicz , H. Abreu , Y. Abulaiti , , B.S. Acharya , ,a ,L. Adamczyk , D.L. Adams , T.N. Addy , J. Adelman , S. Adomeit , T. Adye , S. Aefsky ,T. Agatonovic-Jovin , J.A. Aguilar-Saavedra ,b , M. Agustoni , S.P. Ahlen , A. Ahmad , F. Ahmadov ,c ,M. Ahsan , G. Aielli , , T.P.A. ˚Akesson , G. Akimoto , A.V. Akimov , M.A. Alam , J. Albert ,S. Albrand , M.J. Alconada Verzini , M. Aleksa , I.N. Aleksandrov , F. Alessandria , C. Alexa ,G. Alexander , G. Alexandre , T. Alexopoulos , M. Alhroob , , M. Aliev , G. Alimonti , L. Alio ,J. Alison , B.M.M. Allbrooke , L.J. Allison , P.P. Allport , S.E. Allwood-Spiers , J. Almond ,A. Aloisio , , R. Alon , A. Alonso , F. Alonso , A. Altheimer , B. Alvarez Gonzalez ,M.G. Alviggi , , K. Amako , Y. Amaral Coutinho , C. Amelung , V.V. Ammosov , ∗ ,S.P. Amor Dos Santos , A. Amorim ,d , S. Amoroso , N. Amram , G. Amundsen , C. Anastopoulos ,L.S. Ancu , N. Andari , T. Andeen , C.F. Anders , G. Anders , K.J. Anderson , A. Andreazza , ,V. Andrei , X.S. Anduaga , S. Angelidakis , P. Anger , A. Angerami , F. Anghinolfi , A.V. Anisenkov ,N. Anjos , A. Annovi , A. Antonaki , M. Antonelli , A. Antonov , J. Antos , F. Anulli , M. Aoki ,L. Aperio Bella , R. Apolle ,e , G. Arabidze , I. Aracena , Y. Arai , A.T.H. Arce , S. Arfaoui ,J-F. Arguin , S. Argyropoulos , E. Arik , ∗ , M. Arik , A.J. Armbruster , O. Arnaez , V. Arnal ,O. Arslan , A. Artamonov , G. Artoni , S. Asai , N. Asbah , S. Ask , B. ˚Asman , , L. Asquith ,K. Assamagan , R. Astalos , A. Astbury , M. Atkinson , N.B. Atlay , B. Auerbach , E. Auge ,K. Augsten , M. Aurousseau , G. Avolio , G. Azuelos ,f , Y. Azuma , M.A. Baak , C. Bacci , ,3A.M. Bach , H. Bachacou , K. Bachas , M. Backes , M. Backhaus , J. Backus Mayes , E. Badescu ,P. Bagiacchi , , P. Bagnaia , , Y. Bai , D.C. Bailey , T. Bain , J.T. Baines , O.K. Baker ,S. Baker , P. Balek , F. Balli , E. Banas , Sw. Banerjee , D. Banfi , A. Bangert , V. Bansal ,H.S. Bansil , L. Barak , S.P. Baranov , T. Barber , E.L. Barberio , D. Barberis , , M. Barbero ,T. Barillari , M. Barisonzi , T. Barklow , N. Barlow , B.M. Barnett , R.M. Barnett , A. Baroncelli ,G. Barone , A.J. Barr , F. Barreiro , J. Barreiro Guimar˜aes da Costa , R. Bartoldus , A.E. Barton ,P. Bartos , V. Bartsch , A. Bassalat , A. Basye , R.L. Bates , L. Batkova , J.R. Batley ,M. Battistin , F. Bauer , H.S. Bawa ,g , T. Beau , P.H. Beauchemin , R. Beccherle , P. Bechtle ,H.P. Beck , K. Becker , S. Becker , M. Beckingham , A.J. Beddall , A. Beddall , S. Bedikian ,V.A. Bednyakov , C.P. Bee , L.J. Beemster , T.A. Beermann , M. Begel , K. Behr ,C. Belanger-Champagne , P.J. Bell , W.H. Bell , G. Bella , L. Bellagamba , A. Bellerive , M. Bellomo ,A. Belloni , O.L. Beloborodova ,h , K. Belotskiy , O. Beltramello , O. Benary , D. Benchekroun ,K. Bendtz , , N. Benekos , Y. Benhammou , E. Benhar Noccioli , J.A. Benitez Garcia ,D.P. Benjamin , J.R. Bensinger , K. Benslama , S. Bentvelsen , D. Berge , E. Bergeaas Kuutmann ,N. Berger , F. Berghaus , E. Berglund , J. Beringer , C. Bernard , P. Bernat , R. Bernhard , C. Bernius ,F.U. Bernlochner , T. Berry , P. Berta , C. Bertella , F. Bertolucci , , M.I. Besana , G.J. Besjes ,O. Bessidskaia , , N. Besson , S. Bethke , W. Bhimji , R.M. Bianchi , L. Bianchini , M. Bianco ,O. Biebel , S.P. Bieniek , K. Bierwagen , J. Biesiada , M. Biglietti , J. Bilbao De Mendizabal ,H. Bilokon , M. Bindi , , S. Binet , A. Bingul , C. Bini , , B. Bittner , C.W. Black ,J.E. Black , K.M. Black , D. Blackburn , R.E. Blair , J.-B. Blanchard , T. Blazek , I. Bloch ,C. Blocker , J. Blocki , W. Blum , ∗ , U. Blumenschein , G.J. Bobbink , V.S. Bobrovnikov , S.S. Bocchetta ,A. Bocci , C.R. Boddy , M. Boehler , J. Boek , T.T. Boek , N. Boelaert , J.A. Bogaerts ,A.G. Bogdanchikov , A. Bogouch , ∗ , C. Bohm , J. Bohm , V. Boisvert , T. Bold , V. Boldea ,A.S. Boldyrev , N.M. Bolnet , M. Bomben , M. Bona , M. Boonekamp , S. Bordoni , C. Borer ,A. Borisov , G. Borissov , M. Borri , S. Borroni , J. Bortfeldt , V. Bortolotto , , K. Bos ,D. Boscherini , M. Bosman , H. Boterenbrood , J. Bouchami , J. Boudreau , E.V. Bouhova-Thacker ,D. Boumediene , C. Bourdarios , N. Bousson , S. Boutouil , A. Boveia , J. Boyd , I.R. Boyko ,I. Bozovic-Jelisavcic , J. Bracinik , P. Branchini , A. Brandt , G. Brandt , O. Brandt , U. Bratzler ,B. Brau , J.E. Brau , H.M. Braun , ∗ , S.F. Brazzale , , B. Brelier , K. Brendlinger , R. Brenner ,S. Bressler , T.M. Bristow , D. Britton , F.M. Brochu , I. Brock , R. Brock , F. Broggi , C. Bromberg ,J. Bronner , G. Brooijmans , T. Brooks , W.K. Brooks , J. Brosamer , E. Brost , G. Brown , J. Brown ,P.A. Bruckman de Renstrom , D. Bruncko , R. Bruneliere , S. Brunet , A. Bruni , G. Bruni ,M. Bruschi , L. Bryngemark , T. Buanes , Q. Buat , F. Bucci , P. Buchholz , R.M. Buckingham ,A.G. Buckley , S.I. Buda , I.A. Budagov , B. Budick , F. Buehrer , L. Bugge , M.K. Bugge ,O. Bulekov , A.C. Bundock , M. Bunse , H. Burckhart , S. Burdin , T. Burgess , B. Burghgrave ,S. Burke , I. Burmeister , E. Busato , V. B¨uscher , P. Bussey , C.P. Buszello , B. Butler , J.M. Butler ,A.I. Butt , C.M. Buttar , J.M. Butterworth , W. Buttinger , A. Buzatu , M. Byszewski , S. Cabrera Urb´an ,D. Caforio , , O. Cakir , P. Calafiura , G. Calderini , P. Calfayan , R. Calkins , L.P. Caloba ,R. Caloi , , D. Calvet , S. Calvet , R. Camacho Toro , P. Camarri , , D. Cameron ,L.M. Caminada , R. Caminal Armadans , S. Campana , M. Campanelli , V. Canale , , F. Canelli ,A. Canepa , J. Cantero , R. Cantrill , T. Cao , M.D.M. Capeans Garrido , I. Caprini , M. Caprini ,M. Capua , , R. Caputo , R. Cardarelli , T. Carli , G. Carlino , L. Carminati , , S. Caron ,E. Carquin , G.D. Carrillo-Montoya , A.A. Carter , J.R. Carter , J. Carvalho ,i , D. Casadei ,M.P. Casado , C. Caso , , ∗ , E. Castaneda-Miranda , A. Castelli , V. Castillo Gimenez , N.F. Castro ,P. Catastini , A. Catinaccio , J.R. Catmore , A. Cattai , G. Cattani , , S. Caughron , V. Cavaliere ,D. Cavalli , M. Cavalli-Sforza , V. Cavasinni , , F. Ceradini , , B. Cerio , K. Cerny ,A.S. Cerqueira , A. Cerri , L. Cerrito , F. Cerutti , A. Cervelli , S.A. Cetin , A. Chafaq ,D. Chakraborty , I. Chalupkova , K. Chan , P. Chang , B. Chapleau , J.D. Chapman , D. Charfeddine ,D.G. Charlton , V. Chavda , C.A. Chavez Barajas , S. Cheatham , S. Chekanov , S.V. Chekulaev ,G.A. Chelkov , M.A. Chelstowska , C. Chen , H. Chen , K. Chen , L. Chen , S. Chen , X. Chen ,Y. Chen , Y. Cheng , A. Cheplakov , R. Cherkaoui El Moursli , V. Chernyatin , ∗ , E. Cheu , L. Chevalier ,V. Chiarella , G. Chiefari , , J.T. Childers , A. Chilingarov , G. Chiodini , A.S. Chisholm ,R.T. Chislett , A. Chitan , M.V. Chizhov , S. Chouridou , B.K.B. Chow , I.A. Christidi ,D. Chromek-Burckhart , M.L. Chu , J. Chudoba , G. Ciapetti , , A.K. Ciftci , R. Ciftci , D. Cinca ,V. Cindro , A. Ciocio , M. Cirilli , P. Cirkovic , Z.H. Citron , M. Citterio , M. Ciubancan , A. Clark ,P.J. Clark , R.N. Clarke , J.C. Clemens , B. Clement , C. Clement , , Y. Coadou , M. Cobal , ,A. Coccaro , J. Cochran , S. Coelli , L. Coffey , J.G. Cogan , J. Coggeshall , J. Colas , B. Cole ,S. Cole , A.P. Colijn , C. Collins-Tooth , J. Collot , T. Colombo , G. Colon , G. Compostella ,4P. Conde Mui˜no , E. Coniavitis , M.C. Conidi , I.A. Connelly , S.M. Consonni , , V. Consorti ,S. Constantinescu , C. Conta , , G. Conti , F. Conventi ,j , M. Cooke , B.D. Cooper ,A.M. Cooper-Sarkar , N.J. Cooper-Smith , K. Copic , T. Cornelissen , M. Corradi , F. Corriveau ,k ,A. Corso-Radu , A. Cortes-Gonzalez , G. Cortiana , G. Costa , M.J. Costa , R. Costa Batalha Pedro ,D. Costanzo , D. Cˆot´e , G. Cottin , L. Courneyea , G. Cowan , B.E. Cox , K. Cranmer , G. Cree ,S. Cr´ep´e-Renaudin , F. Crescioli , M. Crispin Ortuzar , M. Cristinziani , G. Crosetti , , C.-M. Cuciuc ,C. Cuenca Almenar , T. Cuhadar Donszelmann , J. Cummings , M. Curatolo , C. Cuthbert , H. Czirr ,P. Czodrowski , Z. Czyczula , S. D’Auria , M. D’Onofrio , A. D’Orazio , ,M.J. Da Cunha Sargedas De Sousa , C. Da Via , W. Dabrowski , A. Dafinca , T. Dai , F. Dallaire ,C. Dallapiccola , M. Dam , A.C. Daniells , M. Dano Hoffmann , V. Dao , G. Darbo , G.L. Darlea ,S. Darmora , J.A. Dassoulas , W. Davey , C. David , T. Davidek , E. Davies ,e , M. Davies ,O. Davignon , A.R. Davison , Y. Davygora , E. Dawe , I. Dawson , R.K. Daya-Ishmukhametova , K. De ,R. de Asmundis , S. De Castro , , S. De Cecco , J. de Graat , N. De Groot , P. de Jong ,C. De La Taille , H. De la Torre , F. De Lorenzi , L. De Nooij , D. De Pedis , A. De Salvo ,U. De Sanctis , , A. De Santo , J.B. De Vivie De Regie , G. De Zorzi , , W.J. Dearnaley ,R. Debbe , C. Debenedetti , B. Dechenaux , D.V. Dedovich , J. Degenhardt , J. Del Peso ,T. Del Prete , , T. Delemontex , F. Deliot , M. Deliyergiyev , A. Dell’Acqua , L. Dell’Asta ,M. Della Pietra ,j , D. della Volpe , , M. Delmastro , P.A. Delsart , C. Deluca , S. Demers ,M. Demichev , A. Demilly , B. Demirkoz ,l , S.P. Denisov , D. Derendarz , J.E. Derkaoui , F. Derue ,P. Dervan , K. Desch , P.O. Deviveiros , A. Dewhurst , B. DeWilde , S. Dhaliwal , R. Dhullipudi ,m ,A. Di Ciaccio , , L. Di Ciaccio , C. Di Donato , , A. Di Girolamo , B. Di Girolamo , A. Di Mattia ,B. Di Micco , , R. Di Nardo , A. Di Simone , R. Di Sipio , , D. Di Valentino , M.A. Diaz ,E.B. Diehl , J. Dietrich , T.A. Dietzsch , S. Diglio , K. Dindar Yagci , J. Dingfelder , C. Dionisi , ,P. Dita , S. Dita , F. Dittus , F. Djama , T. Djobava , M.A.B. do Vale , A. Do Valle Wemans ,n ,T.K.O. Doan , D. Dobos , E. Dobson , J. Dodd , C. Doglioni , T. Doherty , T. Dohmae , J. Dolejsi ,Z. Dolezal , B.A. Dolgoshein , ∗ , M. Donadelli , S. Donati , , P. Dondero , , J. Donini , J. Dopke ,A. Doria , A. Dos Anjos , A. Dotti , , M.T. Dova , A.T. Doyle , M. Dris , J. Dubbert , S. Dube ,E. Dubreuil , E. Duchovni , G. Duckeck , O.A. Ducu , D. Duda , A. Dudarev , F. Dudziak , L. Duflot ,L. Duguid , M. D¨uhrssen , M. Dunford , H. Duran Yildiz , M. D¨uren , M. Dwuznik , J. Ebke , W. Edson ,C.A. Edwards , N.C. Edwards , W. Ehrenfeld , T. Eifert , G. Eigen , K. Einsweiler , E. Eisenhandler ,T. Ekelof , M. El Kacimi , M. Ellert , S. Elles , F. Ellinghaus , K. Ellis , N. Ellis , J. Elmsheuser ,M. Elsing , D. Emeliyanov , Y. Enari , O.C. Endner , M. Endo , R. Engelmann , J. Erdmann ,A. Ereditato , D. Eriksson , G. Ernis , J. Ernst , M. Ernst , J. Ernwein , D. Errede , S. Errede ,E. Ertel , M. Escalier , H. Esch , C. Escobar , X. Espinal Curull , B. Esposito , F. Etienne ,A.I. Etienvre , E. Etzion , D. Evangelakou , H. Evans , L. Fabbri , , G. Facini , R.M. Fakhrutdinov ,S. Falciano , Y. Fang , M. Fanti , , A. Farbin , A. Farilla , T. Farooque , S. Farrell ,S.M. Farrington , P. Farthouat , F. Fassi , P. Fassnacht , D. Fassouliotis , B. Fatholahzadeh ,A. Favareto , , L. Fayard , P. Federic , O.L. Fedin , W. Fedorko , M. Fehling-Kaschek , L. Feligioni ,C. Feng , E.J. Feng , H. Feng , A.B. Fenyuk , W. Fernando , S. Ferrag , J. Ferrando , V. Ferrara ,A. Ferrari , P. Ferrari , R. Ferrari , D.E. Ferreira de Lima , A. Ferrer , D. Ferrere , C. Ferretti ,A. Ferretto Parodi , , M. Fiascaris , F. Fiedler , A. Filipˇciˇc , M. Filipuzzi , F. Filthaut ,M. Fincke-Keeler , K.D. Finelli , M.C.N. Fiolhais ,i , L. Fiorini , A. Firan , J. Fischer , M.J. Fisher ,E.A. Fitzgerald , M. Flechl , I. Fleck , P. Fleischmann , S. Fleischmann , G.T. Fletcher , G. Fletcher ,T. Flick , A. Floderus , L.R. Flores Castillo , A.C. Florez Bustos , M.J. Flowerdew , T. Fonseca Martin ,A. Formica , A. Forti , D. Fortin , D. Fournier , H. Fox , P. Francavilla , M. Franchini , ,S. Franchino , D. Francis , M. Franklin , S. Franz , M. Fraternali , , S. Fratina , S.T. French ,C. Friedrich , F. Friedrich , D. Froidevaux , J.A. Frost , C. Fukunaga , E. Fullana Torregrosa ,B.G. Fulsom , J. Fuster , C. Gabaldon , O. Gabizon , A. Gabrielli , , A. Gabrielli , ,S. Gadatsch , T. Gadfort , S. Gadomski , G. Gagliardi , , P. Gagnon , C. Galea , B. Galhardo ,E.J. Gallas , V. Gallo , B.J. Gallop , P. Gallus , G. Galster , K.K. Gan , R.P. Gandrajula , J. Gao ,o ,Y.S. Gao ,g , F.M. Garay Walls , F. Garberson , C. Garc´ıa , J.E. Garc´ıa Navarro , M. Garcia-Sciveres ,R.W. Gardner , N. Garelli , V. Garonne , C. Gatti , G. Gaudio , B. Gaur , L. Gauthier ,P. Gauzzi , , I.L. Gavrilenko , C. Gay , G. Gaycken , E.N. Gazis , P. Ge ,p , Z. Gecse , C.N.P. Gee ,D.A.A. Geerts , Ch. Geich-Gimbel , K. Gellerstedt , , C. Gemme , A. Gemmell , M.H. Genest ,S. Gentile , , M. George , S. George , D. Gerbaudo , A. Gershon , H. Ghazlane , N. Ghodbane ,B. Giacobbe , S. Giagu , , V. Giangiobbe , P. Giannetti , , F. Gianotti , B. Gibbard ,S.M. Gibson , M. Gilchriese , T.P.S. Gillam , D. Gillberg , A.R. Gillman , D.M. Gingrich ,f , N. Giokaris ,M.P. Giordani , , R. Giordano , , F.M. Giorgi , P. Giovannini , P.F. Giraud , D. Giugni ,5C. Giuliani , M. Giunta , B.K. Gjelsten , I. Gkialas ,q , L.K. Gladilin , C. Glasman , J. Glatzer ,A. Glazov , G.L. Glonti , M. Goblirsch-Kolb , J.R. Goddard , J. Godfrey , J. Godlewski , C. Goeringer ,S. Goldfarb , T. Golling , D. Golubkov , A. Gomes ,d , L.S. Gomez Fajardo , R. Gon¸calo ,J. Goncalves Pinto Firmino Da Costa , L. Gonella , S. Gonz´alez de la Hoz , G. Gonzalez Parra ,M.L. Gonzalez Silva , S. Gonzalez-Sevilla , J.J. Goodson , L. Goossens , P.A. Gorbounov , H.A. Gordon ,I. Gorelov , G. Gorfine , B. Gorini , E. Gorini , , A. Goriˇsek , E. Gornicki , A.T. Goshaw ,C. G¨ossling , M.I. Gostkin , M. Gouighri , D. Goujdami , M.P. Goulette , A.G. Goussiou , C. Goy ,S. Gozpinar , H.M.X. Grabas , L. Graber , I. Grabowska-Bold , P. Grafstr¨om , , K-J. Grahn ,J. Gramling , E. Gramstad , F. Grancagnolo , S. Grancagnolo , V. Grassi , V. Gratchev , H.M. Gray ,J.A. Gray , E. Graziani , O.G. Grebenyuk , Z.D. Greenwood ,m , K. Gregersen , I.M. Gregor ,P. Grenier , J. Griffiths , N. Grigalashvili , A.A. Grillo , K. Grimm , S. Grinstein ,r , Ph. Gris ,Y.V. Grishkevich , J.-F. Grivaz , J.P. Grohs , A. Grohsjean , E. Gross , J. Grosse-Knetter ,G.C. Grossi , , J. Groth-Jensen , Z.J. Grout , K. Grybel , F. Guescini , D. Guest , O. Gueta ,C. Guicheney , E. Guido , , T. Guillemin , S. Guindon , U. Gul , C. Gumpert , J. Gunther , J. Guo ,S. Gupta , P. Gutierrez , N.G. Gutierrez Ortiz , C. Gutschow , N. Guttman , C. Guyot , C. Gwenlan ,C.B. Gwilliam , A. Haas , C. Haber , H.K. Hadavand , P. Haefner , S. Hageboeck , Z. Hajduk ,H. Hakobyan , D. Hall , G. Halladjian , K. Hamacher , P. Hamal , K. Hamano , M. Hamer ,A. Hamilton ,s , S. Hamilton , L. Han , K. Hanagaki , K. Hanawa , M. Hance , P. Hanke ,J.R. Hansen , J.B. Hansen , J.D. Hansen , P.H. Hansen , P. Hansson , K. Hara , A.S. Hard ,T. Harenberg , S. Harkusha , D. Harper , R.D. Harrington , O.M. Harris , P.F. Harrison , F. Hartjes ,A. Harvey , S. Hasegawa , Y. Hasegawa , S. Hassani , S. Haug , M. Hauschild , R. Hauser ,M. Havranek , C.M. Hawkes , R.J. Hawkings , A.D. Hawkins , T. Hayashi , D. Hayden , C.P. Hays ,H.S. Hayward , S.J. Haywood , S.J. Head , T. Heck , V. Hedberg , L. Heelan , S. Heim , B. Heinemann ,S. Heisterkamp , J. Hejbal , L. Helary , C. Heller , M. Heller , S. Hellman , , D. Hellmich ,C. Helsens , J. Henderson , R.C.W. Henderson , A. Henrichs , A.M. Henriques Correia ,S. Henrot-Versille , C. Hensel , G.H. Herbert , C.M. Hernandez , Y. Hern´andez Jim´enez ,R. Herrberg-Schubert , G. Herten , R. Hertenberger , L. Hervas , G.G. Hesketh , N.P. Hessey ,R. Hickling , E. Hig´on-Rodriguez , J.C. Hill , K.H. Hiller , S. Hillert , S.J. Hillier , I. Hinchliffe ,E. Hines , M. Hirose , D. Hirschbuehl , J. Hobbs , N. Hod , M.C. Hodgkinson , P. Hodgson ,A. Hoecker , M.R. Hoeferkamp , J. Hoffman , D. Hoffmann , J.I. Hofmann , M. Hohlfeld , T.R. Holmes ,T.M. Hong , L. Hooft van Huysduynen , J-Y. Hostachy , S. Hou , A. Hoummada , J. Howard ,J. Howarth , M. Hrabovsky , I. Hristova , J. Hrivnac , T. Hryn’ova , P.J. Hsu , S.-C. Hsu , D. Hu ,X. Hu , Y. Huang , Z. Hubacek , F. Hubaut , F. Huegging , A. Huettmann , T.B. Huffman ,E.W. Hughes , G. Hughes , M. Huhtinen , T.A. H¨ulsing , M. Hurwitz , N. Huseynov ,c , J. Huston ,J. Huth , G. Iacobucci , G. Iakovidis , I. Ibragimov , L. Iconomidou-Fayard , J. Idarraga , E. Ideal ,P. Iengo , O. Igonkina , T. Iizawa , Y. Ikegami , K. Ikematsu , M. Ikeno , D. Iliadis , N. Ilic ,Y. Inamaru , T. Ince , P. Ioannou , M. Iodice , K. Iordanidou , V. Ippolito , , A. Irles Quiles ,C. Isaksson , M. Ishino , M. Ishitsuka , R. Ishmukhametov , C. Issever , S. Istin , A.V. Ivashin ,W. Iwanski , H. Iwasaki , J.M. Izen , V. Izzo , B. Jackson , J.N. Jackson , M. Jackson , P. Jackson ,M.R. Jaekel , V. Jain , K. Jakobs , S. Jakobsen , T. Jakoubek , J. Jakubek , D.O. Jamin , D.K. Jana ,E. Jansen , H. Jansen , J. Janssen , M. Janus , R.C. Jared , G. Jarlskog , L. Jeanty , G.-Y. Jeng ,I. Jen-La Plante , D. Jennens , P. Jenni ,t , J. Jentzsch , C. Jeske , S. J´ez´equel , M.K. Jha , H. Ji ,W. Ji , J. Jia , Y. Jiang , M. Jimenez Belenguer , S. Jin , A. Jinaru , O. Jinnouchi , M.D. Joergensen ,D. Joffe , K.E. Johansson , P. Johansson , K.A. Johns , K. Jon-And , , G. Jones , R.W.L. Jones ,T.J. Jones , P.M. Jorge , K.D. Joshi , J. Jovicevic , X. Ju , C.A. Jung , R.M. Jungst , P. Jussel ,A. Juste Rozas ,r , M. Kaci , A. Kaczmarska , P. Kadlecik , M. Kado , H. Kagan , M. Kagan ,E. Kajomovitz , S. Kalinin , S. Kama , N. Kanaya , M. Kaneda , S. Kaneti , T. Kanno ,V.A. Kantserov , J. Kanzaki , B. Kaplan , A. Kapliy , D. Kar , K. Karakostas , N. Karastathis ,M. Karnevskiy , S.N. Karpov , K. Karthik , V. Kartvelishvili , A.N. Karyukhin , L. Kashif ,G. Kasieczka , R.D. Kass , A. Kastanas , Y. Kataoka , A. Katre , J. Katzy , V. Kaushik , K. Kawagoe ,T. Kawamoto , G. Kawamura , S. Kazama , V.F. Kazanin , M.Y. Kazarinov , R. Keeler , P.T. Keener ,R. Kehoe , M. Keil , J.S. Keller , H. Keoshkerian , O. Kepka , B.P. Kerˇsevan , S. Kersten , K. Kessoku ,J. Keung , F. Khalil-zada , H. Khandanyan , , A. Khanov , D. Kharchenko , A. Khodinov ,A. Khomich , T.J. Khoo , G. Khoriauli , A. Khoroshilov , V. Khovanskiy , E. Khramov , J. Khubua ,H. Kim , , S.H. Kim , N. Kimura , O. Kind , B.T. King , M. King , R.S.B. King , S.B. King ,J. Kirk , A.E. Kiryunin , T. Kishimoto , D. Kisielewska , T. Kitamura , T. Kittelmann , K. Kiuchi ,E. Kladiva , M. Klein , U. Klein , K. Kleinknecht , P. Klimek , , A. Klimentov , R. Klingenberg ,J.A. Klinger , E.B. Klinkby , T. Klioutchnikova , P.F. Klok , E.-E. Kluge , P. Kluit , S. Kluth ,6E. Kneringer , E.B.F.G. Knoops , A. Knue , T. Kobayashi , M. Kobel , M. Kocian , P. Kodys ,S. Koenig , P. Koevesarki , T. Koffas , E. Koffeman , L.A. Kogan , S. Kohlmann , Z. Kohout ,T. Kohriki , T. Koi , H. Kolanoski , I. Koletsou , J. Koll , A.A. Komar , ∗ , Y. Komori , T. Kondo ,K. K¨oneke , A.C. K¨onig , T. Kono ,u , R. Konoplich ,v , N. Konstantinidis , R. Kopeliansky , S. Koperny ,L. K¨opke , A.K. Kopp , K. Korcyl , K. Kordas , A. Korn , A.A. Korol , I. Korolkov , E.V. Korolkova ,V.A. Korotkov , O. Kortner , S. Kortner , V.V. Kostyukhin , S. Kotov , V.M. Kotov , A. Kotwal ,C. Kourkoumelis , V. Kouskoura , A. Koutsman , R. Kowalewski , T.Z. Kowalski , W. Kozanecki ,A.S. Kozhin , V. Kral , V.A. Kramarenko , G. Kramberger , M.W. Krasny , A. Krasznahorkay ,J.K. Kraus , A. Kravchenko , S. Kreiss , J. Kretzschmar , K. Kreutzfeldt , N. Krieger , P. Krieger ,K. Kroeninger , H. Kroha , J. Kroll , J. Kroseberg , J. Krstic , U. Kruchonak , H. Kr¨uger , T. Kruker ,N. Krumnack , Z.V. Krumshteyn , A. Kruse , M.C. Kruse , M. Kruskal , T. Kubota , S. Kuday ,S. Kuehn , A. Kugel , T. Kuhl , V. Kukhtin , Y. Kulchitsky , S. Kuleshov , M. Kuna , , J. Kunkle ,A. Kupco , H. Kurashige , M. Kurata , Y.A. Kurochkin , R. Kurumida , V. Kus , E.S. Kuwertz ,M. Kuze , J. Kvita , R. Kwee , A. La Rosa , L. La Rotonda , , L. Labarga , S. Lablak , C. Lacasta ,F. Lacava , , J. Lacey , H. Lacker , D. Lacour , V.R. Lacuesta , E. Ladygin , R. Lafaye , B. Laforge ,T. Lagouri , S. Lai , H. Laier , E. Laisne , L. Lambourne , C.L. Lampen , W. Lampl , E. Lan¸con ,U. Landgraf , M.P.J. Landon , V.S. Lang , C. Lange , A.J. Lankford , F. Lanni , K. Lantzsch ,A. Lanza , S. Laplace , C. Lapoire , J.F. Laporte , T. Lari , A. Larner , M. Lassnig , P. Laurelli ,V. Lavorini , , W. Lavrijsen , P. Laycock , B.T. Le , O. Le Dortz , E. Le Guirriec , E. Le Menedeu ,T. LeCompte , F. Ledroit-Guillon , C.A. Lee , H. Lee , J.S.H. Lee , S.C. Lee , L. Lee , G. Lefebvre ,M. Lefebvre , F. Legger , C. Leggett , A. Lehan , M. Lehmacher , G. Lehmann Miotto , X. Lei ,A.G. Leister , M.A.L. Leite , R. Leitner , D. Lellouch , B. Lemmer , V. Lendermann , K.J.C. Leney ,T. Lenz , G. Lenzen , B. Lenzi , R. Leone , K. Leonhardt , S. Leontsinis , C. Leroy , J-R. Lessard ,C.G. Lester , C.M. Lester , J. Levˆeque , D. Levin , L.J. Levinson , A. Lewis , G.H. Lewis , A.M. Leyko ,M. Leyton , B. Li ,w , B. Li , H. Li , H.L. Li , S. Li , X. Li , Z. Liang ,x , H. Liao , B. Liberti ,P. Lichard , K. Lie , J. Liebal , W. Liebig , C. Limbach , A. Limosani , M. Limper , S.C. Lin ,y ,F. Linde , B.E. Lindquist , J.T. Linnemann , E. Lipeles , A. Lipniacka , M. Lisovyi , T.M. Liss ,D. Lissauer , A. Lister , A.M. Litke , B. Liu , D. Liu , J.B. Liu , K. Liu ,z , L. Liu , M. Liu ,M. Liu , Y. Liu , M. Livan , , S.S.A. Livermore , A. Lleres , J. Llorente Merino , S.L. Lloyd ,F. Lo Sterzo , E. Lobodzinska , P. Loch , W.S. Lockman , T. Loddenkoetter , F.K. Loebinger ,A.E. Loevschall-Jensen , A. Loginov , C.W. Loh , T. Lohse , K. Lohwasser , M. Lokajicek ,V.P. Lombardo , J.D. Long , R.E. Long , L. Lopes , D. Lopez Mateos , B. Lopez Paredes , J. Lorenz ,N. Lorenzo Martinez , M. Losada , P. Loscutoff , M.J. Losty , ∗ , X. Lou , A. Lounis , J. Love ,P.A. Love , A.J. Lowe ,g , F. Lu , H.J. Lubatti , C. Luci , , A. Lucotte , D. Ludwig , I. Ludwig ,F. Luehring , W. Lukas , L. Luminari , E. Lund , J. Lundberg , , O. Lundberg , ,B. Lund-Jensen , M. Lungwitz , D. Lynn , R. Lysak , E. Lytken , H. Ma , L.L. Ma , G. Maccarrone ,A. Macchiolo , B. Maˇcek , J. Machado Miguens , D. Macina , R. Mackeprang , R. Madar , R.J. Madaras ,H.J. Maddocks , W.F. Mader , A. Madsen , M. Maeno , T. Maeno , L. Magnoni , E. Magradze ,K. Mahboubi , J. Mahlstedt , S. Mahmoud , G. Mahout , C. Maiani , C. Maidantchik , A. Maio ,d ,S. Majewski , Y. Makida , N. Makovec , P. Mal ,aa , B. Malaescu , Pa. Malecki , V.P. Maleev ,F. Malek , U. Mallik , D. Malon , C. Malone , S. Maltezos , V.M. Malyshev , S. Malyukov , J. Mamuzic ,L. Mandelli , I. Mandi´c , R. Mandrysch , J. Maneira , A. Manfredini , L. Manhaes de Andrade Filho ,J.A. Manjarres Ramos , A. Mann , P.M. Manning , A. Manousakis-Katsikakis , B. Mansoulie ,R. Mantifel , L. Mapelli , L. March , J.F. Marchand , F. Marchese , , G. Marchiori , M. Marcisovsky ,C.P. Marino , C.N. Marques , F. Marroquim , Z. Marshall , L.F. Marti , S. Marti-Garcia , B. Martin ,B. Martin , J.P. Martin , T.A. Martin , V.J. Martin , B. Martin dit Latour , H. Martinez , M. Martinez ,r ,S. Martin-Haugh , A.C. Martyniuk , M. Marx , F. Marzano , A. Marzin , L. Masetti , T. Mashimo ,R. Mashinistov , J. Masik , A.L. Maslennikov , I. Massa , , N. Massol , P. Mastrandrea ,A. Mastroberardino , , T. Masubuchi , H. Matsunaga , T. Matsushita , P. M¨attig , S. M¨attig ,J. Mattmann , C. Mattravers ,e , J. Maurer , S.J. Maxfield , D.A. Maximov ,h , R. Mazini ,L. Mazzaferro , , M. Mazzanti , G. Mc Goldrick , S.P. Mc Kee , A. McCarn , R.L. McCarthy ,T.G. McCarthy , N.A. McCubbin , K.W. McFarlane , ∗ , J.A. Mcfayden , G. Mchedlidze , T. Mclaughlan ,S.J. McMahon , R.A. McPherson ,k , A. Meade , J. Mechnich , M. Mechtel , M. Medinnis , S. Meehan ,R. Meera-Lebbai , S. Mehlhase , A. Mehta , K. Meier , C. Meineck , B. Meirose , C. Melachrinos ,B.R. Mellado Garcia , F. Meloni , , L. Mendoza Navas , A. Mengarelli , , S. Menke , E. Meoni ,K.M. Mercurio , S. Mergelmeyer , N. Meric , P. Mermod , L. Merola , , C. Meroni , F.S. Merritt ,H. Merritt , A. Messina ,ab , J. Metcalfe , A.S. Mete , C. Meyer , C. Meyer , J-P. Meyer , J. Meyer ,J. Meyer , S. Michal , R.P. Middleton , S. Migas , L. Mijovi´c , G. Mikenberg , M. Mikestikova ,7M. Mikuˇz , D.W. Miller , C. Mills , A. Milov , D.A. Milstead , , D. Milstein , A.A. Minaenko ,M. Mi˜nano Moya , I.A. Minashvili , A.I. Mincer , B. Mindur , M. Mineev , Y. Ming , L.M. Mir ,G. Mirabelli , T. Mitani , J. Mitrevski , V.A. Mitsou , S. Mitsui , P.S. Miyagawa , J.U. Mj¨ornmark ,T. Moa , , V. Moeller , S. Mohapatra , W. Mohr , S. Molander , , R. Moles-Valls , A. Molfetas ,K. M¨onig , C. Monini , J. Monk , E. Monnier , J. Montejo Berlingen , F. Monticelli , S. Monzani , ,R.W. Moore , C. Mora Herrera , A. Moraes , N. Morange , J. Morel , D. Moreno , M. Moreno Ll´acer ,P. Morettini , M. Morgenstern , M. Morii , S. Moritz , A.K. Morley , G. Mornacchi , J.D. Morris ,L. Morvaj , H.G. Moser , M. Mosidze , J. Moss , R. Mount , E. Mountricha ,ac , S.V. Mouraviev , ∗ ,E.J.W. Moyse , R.D. Mudd , F. Mueller , J. Mueller , K. Mueller , T. Mueller , T. Mueller ,D. Muenstermann , Y. Munwes , J.A. Murillo Quijada , W.J. Murray , I. Mussche , E. Musto ,A.G. Myagkov ,ad , M. Myska , O. Nackenhorst , J. Nadal , K. Nagai , R. Nagai , Y. Nagai , K. Nagano ,A. Nagarkar , Y. Nagasaka , M. Nagel , A.M. Nairz , Y. Nakahama , K. Nakamura , T. Nakamura ,I. Nakano , H. Namasivayam , G. Nanava , A. Napier , R. Narayan , M. Nash ,e , T. Nattermann ,T. Naumann , G. Navarro , H.A. Neal , P.Yu. Nechaeva , T.J. Neep , A. Negri , , G. Negri ,M. Negrini , S. Nektarijevic , A. Nelson , T.K. Nelson , S. Nemecek , P. Nemethy , A.A. Nepomuceno ,M. Nessi ,ae , M.S. Neubauer , M. Neumann , A. Neusiedl , R.M. Neves , P. Nevski , F.M. Newcomer ,P.R. Newman , D.H. Nguyen , V. Nguyen Thi Hong , R.B. Nickerson , R. Nicolaidou , B. Nicquevert ,J. Nielsen , N. Nikiforou , A. Nikiforov , V. Nikolaenko ,ad , I. Nikolic-Audit , K. Nikolics ,K. Nikolopoulos , P. Nilsson , Y. Ninomiya , A. Nisati , R. Nisius , T. Nobe , L. Nodulman ,M. Nomachi , I. Nomidis , S. Norberg , M. Nordberg , J. Novakova , M. Nozaki , L. Nozka ,K. Ntekas , A.-E. Nuncio-Quiroz , G. Nunes Hanninger , T. Nunnemann , E. Nurse , B.J. O’Brien ,F. O’grady , D.C. O’Neil , V. O’Shea , L.B. Oakes , F.G. Oakham ,f , H. Oberlack , J. Ocariz , A. Ochi ,M.I. Ochoa , S. Oda , S. Odaka , H. Ogren , A. Oh , S.H. Oh , C.C. Ohm , T. Ohshima , W. Okamura ,H. Okawa , Y. Okumura , T. Okuyama , A. Olariu , A.G. Olchevski , S.A. Olivares Pino , M. Oliveira ,i ,D. Oliveira Damazio , E. Oliver Garcia , D. Olivito , A. Olszewski , J. Olszowska , A. Onofre ,af ,P.U.E. Onyisi ,ag , C.J. Oram , M.J. Oreglia , Y. Oren , D. Orestano , , N. Orlando , ,C. Oropeza Barrera , R.S. Orr , B. Osculati , , R. Ospanov , G. Otero y Garzon , H. Otono ,M. Ouchrif , E.A. Ouellette , F. Ould-Saada , A. Ouraou , K.P. Oussoren , Q. Ouyang ,A. Ovcharova , M. Owen , S. Owen , V.E. Ozcan , N. Ozturk , K. Pachal , A. Pacheco Pages ,C. Padilla Aranda , S. Pagan Griso , E. Paganis , C. Pahl , F. Paige , P. Pais , K. Pajchel ,G. Palacino , S. Palestini , D. Pallin , A. Palma , J.D. Palmer , Y.B. Pan , E. Panagiotopoulou ,J.G. Panduro Vazquez , P. Pani , N. Panikashvili , S. Panitkin , D. Pantea , Th.D. Papadopoulou ,K. Papageorgiou ,q , A. Paramonov , D. Paredes Hernandez , M.A. Parker , F. Parodi , , J.A. Parsons ,U. Parzefall , S. Pashapour , E. Pasqualucci , S. Passaggio , A. Passeri , F. Pastore , , ∗ ,Fr. Pastore , G. P´asztor ,ah , S. Pataraia , N.D. Patel , J.R. Pater , S. Patricelli , , T. Pauly ,J. Pearce , M. Pedersen , S. Pedraza Lopez , S.V. Peleganchuk , D. Pelikan , H. Peng , B. Penning ,J. Penwell , D.V. Perepelitsa , T. Perez Cavalcanti , E. Perez Codina , M.T. P´erez Garc´ıa-Esta˜n ,V. Perez Reale , L. Perini , , H. Pernegger , R. Perrino , R. Peschke , V.D. Peshekhonov , K. Peters ,R.F.Y. Peters ,ai , B.A. Petersen , J. Petersen , T.C. Petersen , E. Petit , A. Petridis , , C. Petridou ,E. Petrolo , F. Petrucci , , M. Petteni , R. Pezoa , P.W. Phillips , G. Piacquadio , E. Pianori ,A. Picazio , E. Piccaro , M. Piccinini , , S.M. Piec , R. Piegaia , D.T. Pignotti , J.E. Pilcher ,A.D. Pilkington , J. Pina ,d , M. Pinamonti , ,aj , A. Pinder , J.L. Pinfold , A. Pingel , B. Pinto ,C. Pizio , , M.-A. Pleier , V. Pleskot , E. Plotnikova , P. Plucinski , , S. Poddar , F. Podlyski ,R. Poettgen , L. Poggioli , D. Pohl , M. Pohl , G. Polesello , A. Policicchio , , R. Polifka ,A. Polini , C.S. Pollard , V. Polychronakos , D. Pomeroy , K. Pomm`es , L. Pontecorvo , B.G. Pope ,G.A. Popeneciu , D.S. Popovic , A. Poppleton , X. Portell Bueso , G.E. Pospelov , S. Pospisil ,K. Potamianos , I.N. Potrap , C.J. Potter , C.T. Potter , G. Poulard , J. Poveda , V. Pozdnyakov ,R. Prabhu , P. Pralavorio , A. Pranko , S. Prasad , R. Pravahan , S. Prell , D. Price , J. Price , L.E. Price ,D. Prieur , M. Primavera , M. Proissl , K. Prokofiev , F. Prokoshin , E. Protopapadaki ,S. Protopopescu , J. Proudfoot , X. Prudent , M. Przybycien , H. Przysiezniak , S. Psoroulas , E. Ptacek ,E. Pueschel , D. Puldon , M. Purohit ,ak , P. Puzo , Y. Pylypchenko , J. Qian , A. Quadt , D.R. Quarrie ,W.B. Quayle , D. Quilty , V. Radeka , V. Radescu , S.K. Radhakrishnan , P. Radloff , F. Ragusa , ,G. Rahal , S. Rajagopalan , M. Rammensee , M. Rammes , A.S. Randle-Conde , C. Rangel-Smith ,K. Rao , F. Rauscher , T.C. Rave , T. Ravenscroft , M. Raymond , A.L. Read , D.M. Rebuzzi , ,A. Redelbach , G. Redlinger , R. Reece , K. Reeves , A. Reinsch , H. Reisin , I. Reisinger , M. Relich ,C. Rembser , Z.L. Ren , A. Renaud , M. Rescigno , S. Resconi , B. Resende , P. Reznicek ,R. Rezvani , R. Richter , E. Richter-Was , M. Ridel , P. Rieck , M. Rijssenbeek , A. Rimoldi , ,L. Rinaldi , E. Ritsch , I. Riu , G. Rivoltella , , F. Rizatdinova , E. Rizvi , S.H. Robertson ,k ,8A. Robichaud-Veronneau , D. Robinson , J.E.M. Robinson , A. Robson , J.G. Rocha de Lima ,C. Roda , , D. Roda Dos Santos , L. Rodrigues , S. Roe , O. Røhne , S. Rolli , A. Romaniouk ,M. Romano , , G. Romeo , E. Romero Adam , N. Rompotis , L. Roos , E. Ros , S. Rosati ,K. Rosbach , A. Rose , M. Rose , P.L. Rosendahl , O. Rosenthal , V. Rossetti , , E. Rossi , ,L.P. Rossi , R. Rosten , M. Rotaru , I. Roth , J. Rothberg , D. Rousseau , C.R. Royon ,A. Rozanov , Y. Rozen , X. Ruan , F. Rubbo , I. Rubinskiy , V.I. Rud , C. Rudolph , M.S. Rudolph ,F. R¨uhr , A. Ruiz-Martinez , L. Rumyantsev , Z. Rurikova , N.A. Rusakovich , A. Ruschke ,J.P. Rutherfoord , N. Ruthmann , P. Ruzicka , Y.F. Ryabov , M. Rybar , G. Rybkin , N.C. Ryder ,A.F. Saavedra , S. Sacerdoti , A. Saddique , I. Sadeh , H.F-W. Sadrozinski , R. Sadykov ,F. Safai Tehrani , H. Sakamoto , Y. Sakurai , G. Salamanna , A. Salamon , M. Saleem , D. Salek ,P.H. Sales De Bruin , D. Salihagic , A. Salnikov , J. Salt , B.M. Salvachua Ferrando , D. Salvatore , ,F. Salvatore , A. Salvucci , A. Salzburger , D. Sampsonidis , A. Sanchez , , J. S´anchez ,V. Sanchez Martinez , H. Sandaker , H.G. Sander , M.P. Sanders , M. Sandhoff , T. Sandoval ,C. Sandoval , R. Sandstroem , D.P.C. Sankey , A. Sansoni , C. Santoni , R. Santonico , ,H. Santos , I. Santoyo Castillo , K. Sapp , A. Sapronov , J.G. Saraiva , E. Sarkisyan-Grinbaum ,B. Sarrazin , G. Sartisohn , O. Sasaki , Y. Sasaki , N. Sasao , I. Satsounkevitch , G. Sauvage , ∗ , E. Sauvan ,J.B. Sauvan , P. Savard ,f , V. Savinov , D.O. Savu , C. Sawyer , L. Sawyer ,m , D.H. Saxon , J. Saxon ,C. Sbarra , A. Sbrizzi , T. Scanlon , D.A. Scannicchio , M. Scarcella , J. Schaarschmidt , P. Schacht ,D. Schaefer , A. Schaelicke , S. Schaepe , S. Schaetzel , U. Sch¨afer , A.C. Schaffer , D. Schaile ,R.D. Schamberger , V. Scharf , V.A. Schegelsky , D. Scheirich , M. Schernau , M.I. Scherzer ,C. Schiavi , , J. Schieck , C. Schillo , M. Schioppa , , S. Schlenker , E. Schmidt , K. Schmieden ,C. Schmitt , C. Schmitt , S. Schmitt , B. Schneider , Y.J. Schnellbach , U. Schnoor , L. Schoeffel ,A. Schoening , B.D. Schoenrock , A.L.S. Schorlemmer , M. Schott , D. Schouten , J. Schovancova ,M. Schram , S. Schramm , M. Schreyer , C. Schroeder , N. Schroer , N. Schuh , M.J. Schultens ,H.-C. Schultz-Coulon , H. Schulz , M. Schumacher , B.A. Schumm , Ph. Schune , A. Schwartzman ,Ph. Schwegler , Ph. Schwemling , R. Schwienhorst , J. Schwindling , T. Schwindt , M. Schwoerer ,F.G. Sciacca , E. Scifo , G. Sciolla , W.G. Scott , F. Scutti , J. Searcy , G. Sedov , E. Sedykh ,S.C. Seidel , A. Seiden , F. Seifert , J.M. Seixas , G. Sekhniaidze , S.J. Sekula , K.E. Selbach ,D.M. Seliverstov , G. Sellers , M. Seman , N. Semprini-Cesari , , C. Serfon , L. Serin , L. Serkin ,T. Serre , R. Seuster , H. Severini , F. Sforza , A. Sfyrla , E. Shabalina , M. Shamim , L.Y. Shan ,J.T. Shank , Q.T. Shao , M. Shapiro , P.B. Shatalov , K. Shaw , , P. Sherwood , S. Shimizu ,M. Shimojima , T. Shin , M. Shiyakova , A. Shmeleva , M.J. Shochet , D. Short , S. Shrestha ,E. Shulga , M.A. Shupe , S. Shushkevich , P. Sicho , D. Sidorov , A. Sidoti , F. Siegert , Dj. Sijacki ,O. Silbert , J. Silva , Y. Silver , D. Silverstein , S.B. Silverstein , V. Simak , O. Simard , Lj. Simic ,S. Simion , E. Simioni , B. Simmons , R. Simoniello , , M. Simonyan , P. Sinervo , N.B. Sinev ,V. Sipica , G. Siragusa , A. Sircar , A.N. Sisakyan , ∗ , S.Yu. Sivoklokov , J. Sj¨olin , , T.B. Sjursen ,L.A. Skinnari , H.P. Skottowe , K.Yu. Skovpen , P. Skubic , M. Slater , T. Slavicek , K. Sliwa ,V. Smakhtin , B.H. Smart , L. Smestad , S.Yu. Smirnov , Y. Smirnov , L.N. Smirnova ,al , O. Smirnova ,K.M. Smith , M. Smizanska , K. Smolek , A.A. Snesarev , G. Snidero , J. Snow , S. Snyder , R. Sobie ,k ,F. Socher , J. Sodomka , A. Soffer , D.A. Soh ,x , C.A. Solans , M. Solar , J. Solc , E.Yu. Soldatov ,U. Soldevila , E. Solfaroli Camillocci , , A.A. Solodkov , O.V. Solovyanov , V. Solovyev , N. Soni ,A. Sood , V. Sopko , B. Sopko , M. Sosebee , R. Soualah , , P. Soueid , A.M. Soukharev , D. South ,S. Spagnolo , , F. Span`o , W.R. Spearman , R. Spighi , G. Spigo , M. Spousta ,am , T. Spreitzer ,B. Spurlock , R.D. St. Denis , J. Stahlman , R. Stamen , E. Stanecka , R.W. Stanek , C. Stanescu ,M. Stanescu-Bellu , M.M. Stanitzki , S. Stapnes , E.A. Starchenko , J. Stark , P. Staroba ,P. Starovoitov , R. Staszewski , P. Stavina , ∗ , G. Steele , P. Steinbach , P. Steinberg , I. Stekl ,B. Stelzer , H.J. Stelzer , O. Stelzer-Chilton , H. Stenzel , S. Stern , G.A. Stewart , J.A. Stillings ,M.C. Stockton , M. Stoebe , K. Stoerig , G. Stoicea , S. Stonjek , A.R. Stradling , A. Straessner ,J. Strandberg , S. Strandberg , , A. Strandlie , E. Strauss , M. Strauss , P. Strizenec ,R. Str¨ohmer , D.M. Strom , R. Stroynowski , S.A. Stucci , B. Stugu , I. Stumer , ∗ , J. Stupak ,P. Sturm , N.A. Styles , D. Su , J. Su , HS. Subramania , R. Subramaniam , A. Succurro , Y. Sugaya ,C. Suhr , M. Suk , V.V. Sulin , S. Sultansoy , T. Sumida , X. Sun , J.E. Sundermann , K. Suruliz ,G. Susinno , , M.R. Sutton , Y. Suzuki , M. Svatos , S. Swedish , M. Swiatlowski , I. Sykora ,T. Sykora , D. Ta , K. Tackmann , J. Taenzer , A. Taffard , R. Tafirout , N. Taiblum ,Y. Takahashi , H. Takai , R. Takashima , H. Takeda , T. Takeshita , Y. Takubo , M. Talby ,A.A. Talyshev ,h , J.Y.C. Tam , M.C. Tamsett ,an , K.G. Tan , J. Tanaka , R. Tanaka , S. Tanaka ,S. Tanaka , A.J. Tanasijczuk , K. Tani , N. Tannoury , S. Tapprogge , S. Tarem , F. Tarrade ,G.F. Tartarelli , P. Tas , M. Tasevsky , T. Tashiro , E. Tassi , , A. Tavares Delgado , Y. Tayalati ,9C. Taylor , F.E. Taylor , G.N. Taylor , W. Taylor , F.A. Teischinger , M. Teixeira Dias Castanheira ,P. Teixeira-Dias , K.K. Temming , H. Ten Kate , P.K. Teng , S. Terada , K. Terashi , J. Terron ,S. Terzo , M. Testa , R.J. Teuscher ,k , J. Therhaag , T. Theveneaux-Pelzer , S. Thoma , J.P. Thomas ,E.N. Thompson , P.D. Thompson , P.D. Thompson , A.S. Thompson , L.A. Thomsen , E. Thomson ,M. Thomson , W.M. Thong , R.P. Thun , ∗ , F. Tian , M.J. Tibbetts , T. Tic , V.O. Tikhomirov ,ao ,Yu.A. Tikhonov ,h , S. Timoshenko , E. Tiouchichine , P. Tipton , S. Tisserant , T. Todorov ,S. Todorova-Nova , B. Toggerson , J. Tojo , S. Tok´ar , K. Tokushuku , K. Tollefson , L. Tomlinson ,M. Tomoto , L. Tompkins , K. Toms , N.D. Topilin , E. Torrence , H. Torres , E. Torr´o Pastor ,J. Toth ,ah , F. Touchard , D.R. Tovey , H.L. Tran , T. Trefzger , L. Tremblet , A. Tricoli ,I.M. Trigger , S. Trincaz-Duvoid , M.F. Tripiana , N. Triplett , W. Trischuk , B. Trocm´e , C. Troncon ,M. Trottier-McDonald , M. Trovatelli , , P. True , M. Trzebinski , A. Trzupek , C. Tsarouchas ,J.C-L. Tseng , P.V. Tsiareshka , D. Tsionou , G. Tsipolitis , N. Tsirintanis , S. Tsiskaridze ,V. Tsiskaridze , E.G. Tskhadadze , I.I. Tsukerman , V. Tsulaia , J.-W. Tsung , S. Tsuno , D. Tsybychev ,A. Tua , A. Tudorache , V. Tudorache , J.M. Tuggle , A.N. Tuna , S.A. Tupputi , , S. Turchikhin ,al ,D. Turecek , I. Turk Cakir , R. Turra , , P.M. Tuts , A. Tykhonov , M. Tylmad , , M. Tyndel ,K. Uchida , I. Ueda , R. Ueno , M. Ughetto , M. Ugland , M. Uhlenbrock , F. Ukegawa , G. Unal ,A. Undrus , G. Unel , F.C. Ungaro , Y. Unno , D. Urbaniec , P. Urquijo , G. Usai , A. Usanova ,L. Vacavant , V. Vacek , B. Vachon , N. Valencic , S. Valentinetti , , A. Valero , L. Valery ,S. Valkar , E. Valladolid Gallego , S. Vallecorsa , J.A. Valls Ferrer , R. Van Berg , P.C. Van Der Deijl ,R. van der Geer , H. van der Graaf , R. Van Der Leeuw , D. van der Ster , N. van Eldik ,P. van Gemmeren , J. Van Nieuwkoop , I. van Vulpen , M.C. van Woerden , M. Vanadia , W. Vandelli ,A. Vaniachine , P. Vankov , F. Vannucci , G. Vardanyan , R. Vari , E.W. Varnes , T. Varol ,D. Varouchas , A. Vartapetian , K.E. Varvell , V.I. Vassilakopoulos , F. Vazeille , T. Vazquez Schroeder ,J. Veatch , F. Veloso , S. Veneziano , A. Ventura , , D. Ventura , M. Venturi , N. Venturi ,A. Venturini , V. Vercesi , M. Verducci , W. Verkerke , J.C. Vermeulen , A. Vest , M.C. Vetterli ,f ,O. Viazlo , I. Vichou , T. Vickey ,ap , O.E. Vickey Boeriu , G.H.A. Viehhauser , S. Viel , R. Vigne ,M. Villa , , M. Villaplana Perez , E. Vilucchi , M.G. Vincter , V.B. Vinogradov , J. Virzi , O. Vitells ,M. Viti , I. Vivarelli , F. Vives Vaque , S. Vlachos , D. Vladoiu , M. Vlasak , A. Vogel , P. Vokac ,G. Volpi , M. Volpi , G. Volpini , H. von der Schmitt , H. von Radziewski , E. von Toerne , V. Vorobel ,M. Vos , R. Voss , J.H. Vossebeld , N. Vranjes , M. Vranjes Milosavljevic , V. Vrba , M. Vreeswijk ,T. Vu Anh , R. Vuillermet , I. Vukotic , Z. Vykydal , W. Wagner , P. Wagner , S. Wahrmund ,J. Wakabayashi , S. Walch , J. Walder , R. Walker , W. Walkowiak , R. Wall , P. Waller , B. Walsh ,C. Wang , H. Wang , H. Wang , J. Wang , J. Wang , K. Wang , R. Wang , S.M. Wang , T. Wang ,X. Wang , A. Warburton , C.P. Ward , D.R. Wardrope , M. Warsinsky , A. Washbrook , C. Wasicki ,I. Watanabe , P.M. Watkins , A.T. Watson , I.J. Watson , M.F. Watson , G. Watts , S. Watts ,A.T. Waugh , B.M. Waugh , S. Webb , M.S. Weber , S.W. Weber , J.S. Webster , A.R. Weidberg ,P. Weigell , J. Weingarten , C. Weiser , H. Weits , P.S. Wells , T. Wenaus , D. Wendland , Z. Weng ,x ,T. Wengler , S. Wenig , N. Wermes , M. Werner , P. Werner , M. Wessels , J. Wetter , K. Whalen ,A. White , M.J. White , R. White , S. White , , D. Whiteson , D. Whittington , D. Wicke ,F.J. Wickens , W. Wiedenmann , M. Wielers ,e , P. Wienemann , C. Wiglesworth , L.A.M. Wiik-Fuchs ,P.A. Wijeratne , A. Wildauer , M.A. Wildt ,aq , I. Wilhelm , H.G. Wilkens , J.Z. Will , H.H. Williams ,S. Williams , W. Willis , ∗ , S. Willocq , J.A. Wilson , A. Wilson , I. Wingerter-Seez , S. Winkelmann ,F. Winklmeier , M. Wittgen , T. Wittig , J. Wittkowski , S.J. Wollstadt , M.W. Wolter , H. Wolters ,i ,W.C. Wong , B.K. Wosiek , J. Wotschack , M.J. Woudstra , K.W. Wozniak , K. Wraight , M. Wright ,S.L. Wu , X. Wu , Y. Wu , E. Wulf , T.R. Wyatt , B.M. Wynne , S. Xella , M. Xiao , C. Xu ,ac ,D. Xu , L. Xu ,ar , B. Yabsley , S. Yacoob ,as , M. Yamada , H. Yamaguchi , Y. Yamaguchi ,A. Yamamoto , K. Yamamoto , S. Yamamoto , T. Yamamura , T. Yamanaka , K. Yamauchi ,Y. Yamazaki , Z. Yan , H. Yang , H. Yang , U.K. Yang , Y. Yang , S. Yanush , L. Yao , Y. Yasu ,E. Yatsenko , K.H. Yau Wong , J. Ye , S. Ye , A.L. Yen , E. Yildirim , M. Yilmaz , R. Yoosoofmiya ,K. Yorita , R. Yoshida , K. Yoshihara , C. Young , C.J.S. Young , S. Youssef , D.R. Yu , J. Yu , J. Yu ,L. Yuan , A. Yurkewicz , B. Zabinski , R. Zaidan , A.M. Zaitsev ,ad , A. Zaman , S. Zambito ,L. Zanello , , D. Zanzi , A. Zaytsev , C. Zeitnitz , M. Zeman , A. Zemla , K. Zengel , O. Zenin ,T. ˇZeniˇs , D. Zerwas , G. Zevi della Porta , D. Zhang , H. Zhang , J. Zhang , L. Zhang , X. Zhang ,Z. Zhang , Z. Zhao , A. Zhemchugov , J. Zhong , B. Zhou , L. Zhou , N. Zhou , C.G. Zhu , H. Zhu ,J. Zhu , Y. Zhu , X. Zhuang , A. Zibell , D. Zieminska , N.I. Zimin , C. Zimmermann , R. Zimmermann ,S. Zimmermann , S. Zimmermann , Z. Zinonos , M. Ziolkowski , R. Zitoun , L. ˇZivkovi´c , G. Zobernig ,A. Zoccoli , , M. zur Nedden , G. Zurzolo , , V. Zutshi , L. Zwalinski .0 School of Chemistry and Physics, University of Adelaide, Adelaide, Australia Physics Department, SUNY Albany, Albany NY, United States of America Department of Physics, University of Alberta, Edmonton AB, Canada a ) Department of Physics, Ankara University, Ankara; ( b ) Department of Physics, Gazi University, Ankara; ( c ) Division of Physics, TOBB University of Economics and Technology, Ankara; ( d ) Turkish Atomic Energy Authority,Ankara, Turkey LAPP, CNRS/IN2P3 and Universit´e de Savoie, Annecy-le-Vieux, France High Energy Physics Division, Argonne National Laboratory, Argonne IL, United States of America Department of Physics, University of Arizona, Tucson AZ, United States of America Department of Physics, The University of Texas at Arlington, Arlington TX, United States of America Physics Department, University of Athens, Athens, Greece Physics Department, National Technical University of Athens, Zografou, Greece Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan Institut de F´ısica d’Altes Energies and Departament de F´ısica de la Universitat Aut`onoma de Barcelona,Barcelona, Spain
13 ( a ) Institute of Physics, University of Belgrade, Belgrade; ( b ) Vinca Institute of Nuclear Sciences, University ofBelgrade, Belgrade, Serbia Department for Physics and Technology, University of Bergen, Bergen, Norway Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley CA, UnitedStates of America Department of Physics, Humboldt University, Berlin, Germany Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern,Bern, Switzerland School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
19 ( a ) Department of Physics, Bogazici University, Istanbul; ( b ) Department of Physics, Dogus University, Istanbul; ( c ) Department of Physics Engineering, Gaziantep University, Gaziantep, Turkey
20 ( a ) INFN Sezione di Bologna; ( b ) Dipartimento di Fisica e Astronomia, Universit`a di Bologna, Bologna, Italy Physikalisches Institut, University of Bonn, Bonn, Germany Department of Physics, Boston University, Boston MA, United States of America Department of Physics, Brandeis University, Waltham MA, United States of America
24 ( a ) Universidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro; ( b ) Federal University of Juiz de Fora(UFJF), Juiz de Fora; ( c ) Federal University of Sao Joao del Rei (UFSJ), Sao Joao del Rei; ( d ) Instituto de Fisica,Universidade de Sao Paulo, Sao Paulo, Brazil Physics Department, Brookhaven National Laboratory, Upton NY, United States of America
26 ( a ) National Institute of Physics and Nuclear Engineering, Bucharest; ( b ) National Institute for Research andDevelopment of Isotopic and Molecular Technologies, Physics Department, Cluj Napoca; ( c ) University PolitehnicaBucharest, Bucharest; ( d ) West University in Timisoara, Timisoara, Romania Departamento de F´ısica, Universidad de Buenos Aires, Buenos Aires, Argentina Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom Department of Physics, Carleton University, Ottawa ON, Canada CERN, Geneva, Switzerland Enrico Fermi Institute, University of Chicago, Chicago IL, United States of America
32 ( a ) Departamento de F´ısica, Pontificia Universidad Cat´olica de Chile, Santiago; ( b ) Departamento de F´ısica,Universidad T´ecnica Federico Santa Mar´ıa, Valpara´ıso, Chile
33 ( a ) Institute of High Energy Physics, Chinese Academy of Sciences, Beijing; ( b ) Department of Modern Physics,University of Science and Technology of China, Anhui; ( c ) Department of Physics, Nanjing University, Jiangsu; ( d ) School of Physics, Shandong University, Shandong; ( e ) Physics Department, Shanghai Jiao Tong University,Shanghai, China Laboratoire de Physique Corpusculaire, Clermont Universit´e and Universit´e Blaise Pascal and CNRS/IN2P3,Clermont-Ferrand, France Nevis Laboratory, Columbia University, Irvington NY, United States of America Niels Bohr Institute, University of Copenhagen, Kobenhavn, Denmark
37 ( a ) INFN Gruppo Collegato di Cosenza; ( b ) Dipartimento di Fisica, Universit`a della Calabria, Rende, Italy
38 ( a ) AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow; ( b ) Marian Smoluchowski Institute of Physics, Jagiellonian University, Krakow, Poland The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Krakow, Poland Physics Department, Southern Methodist University, Dallas TX, United States of America Physics Department, University of Texas at Dallas, Richardson TX, United States of America1 DESY, Hamburg and Zeuthen, Germany Institut f¨ur Experimentelle Physik IV, Technische Universit¨at Dortmund, Dortmund, Germany Institut f¨ur Kern- und Teilchenphysik, Technische Universit¨at Dresden, Dresden, Germany Department of Physics, Duke University, Durham NC, United States of America SUPA - School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom INFN Laboratori Nazionali di Frascati, Frascati, Italy Fakult¨at f¨ur Mathematik und Physik, Albert-Ludwigs-Universit¨at, Freiburg, Germany Section de Physique, Universit´e de Gen`eve, Geneva, Switzerland
50 ( a ) INFN Sezione di Genova; ( b ) Dipartimento di Fisica, Universit`a di Genova, Genova, Italy
51 ( a ) E. Andronikashvili Institute of Physics, Iv. Javakhishvili Tbilisi State University, Tbilisi; ( b ) High EnergyPhysics Institute, Tbilisi State University, Tbilisi, Georgia II Physikalisches Institut, Justus-Liebig-Universit¨at Giessen, Giessen, Germany SUPA - School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom II Physikalisches Institut, Georg-August-Universit¨at, G¨ottingen, Germany Laboratoire de Physique Subatomique et de Cosmologie, Universit´e Joseph Fourier and CNRS/IN2P3 andInstitut National Polytechnique de Grenoble, Grenoble, France Department of Physics, Hampton University, Hampton VA, United States of America Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge MA, United States of America
58 ( a ) Kirchhoff-Institut f¨ur Physik, Ruprecht-Karls-Universit¨at Heidelberg, Heidelberg; ( b ) Physikalisches Institut,Ruprecht-Karls-Universit¨at Heidelberg, Heidelberg; ( c ) ZITI Institut f¨ur technische Informatik,Ruprecht-Karls-Universit¨at Heidelberg, Mannheim, Germany Faculty of Applied Information Science, Hiroshima Institute of Technology, Hiroshima, Japan Department of Physics, Indiana University, Bloomington IN, United States of America Institut f¨ur Astro- und Teilchenphysik, Leopold-Franzens-Universit¨at, Innsbruck, Austria University of Iowa, Iowa City IA, United States of America Department of Physics and Astronomy, Iowa State University, Ames IA, United States of America Joint Institute for Nuclear Research, JINR Dubna, Dubna, Russia KEK, High Energy Accelerator Research Organization, Tsukuba, Japan Graduate School of Science, Kobe University, Kobe, Japan Faculty of Science, Kyoto University, Kyoto, Japan Kyoto University of Education, Kyoto, Japan Department of Physics, Kyushu University, Fukuoka, Japan Instituto de F´ısica La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina Physics Department, Lancaster University, Lancaster, United Kingdom
72 ( a ) INFN Sezione di Lecce; ( b ) Dipartimento di Matematica e Fisica, Universit`a del Salento, Lecce, Italy Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom Department of Physics, Joˇzef Stefan Institute and University of Ljubljana, Ljubljana, Slovenia School of Physics and Astronomy, Queen Mary University of London, London, United Kingdom Department of Physics, Royal Holloway University of London, Surrey, United Kingdom Department of Physics and Astronomy, University College London, London, United Kingdom Louisiana Tech University, Ruston LA, United States of America Laboratoire de Physique Nucl´eaire et de Hautes Energies, UPMC and Universit´e Paris-Diderot andCNRS/IN2P3, Paris, France Fysiska institutionen, Lunds universitet, Lund, Sweden Departamento de Fisica Teorica C-15, Universidad Autonoma de Madrid, Madrid, Spain Institut f¨ur Physik, Universit¨at Mainz, Mainz, Germany School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom CPPM, Aix-Marseille Universit´e and CNRS/IN2P3, Marseille, France Department of Physics, University of Massachusetts, Amherst MA, United States of America Department of Physics, McGill University, Montreal QC, Canada School of Physics, University of Melbourne, Victoria, Australia Department of Physics, The University of Michigan, Ann Arbor MI, United States of America Department of Physics and Astronomy, Michigan State University, East Lansing MI, United States of America
90 ( a ) INFN Sezione di Milano; ( b ) Dipartimento di Fisica, Universit`a di Milano, Milano, Italy B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Republic of Belarus National Scientific and Educational Centre for Particle and High Energy Physics, Minsk, Republic of Belarus Department of Physics, Massachusetts Institute of Technology, Cambridge MA, United States of America Group of Particle Physics, University of Montreal, Montreal QC, Canada2 P.N. Lebedev Institute of Physics, Academy of Sciences, Moscow, Russia Institute for Theoretical and Experimental Physics (ITEP), Moscow, Russia Moscow Engineering and Physics Institute (MEPhI), Moscow, Russia D.V.Skobeltsyn Institute of Nuclear Physics, M.V.Lomonosov Moscow State University, Moscow, Russia Fakult¨at f¨ur Physik, Ludwig-Maximilians-Universit¨at M¨unchen, M¨unchen, Germany
Max-Planck-Institut f¨ur Physik (Werner-Heisenberg-Institut), M¨unchen, Germany
Nagasaki Institute of Applied Science, Nagasaki, Japan
Graduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya, Japan
103 ( a ) INFN Sezione di Napoli; ( b ) Dipartimento di Scienze Fisiche, Universit`a di Napoli, Napoli, Italy
Department of Physics and Astronomy, University of New Mexico, Albuquerque NM, United States of America
Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen,Netherlands
Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, Netherlands
Department of Physics, Northern Illinois University, DeKalb IL, United States of America
Budker Institute of Nuclear Physics, SB RAS, Novosibirsk, Russia
Department of Physics, New York University, New York NY, United States of America
Ohio State University, Columbus OH, United States of America
Faculty of Science, Okayama University, Okayama, Japan
Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman OK, United States ofAmerica
Department of Physics, Oklahoma State University, Stillwater OK, United States of America
Palack´y University, RCPTM, Olomouc, Czech Republic
Center for High Energy Physics, University of Oregon, Eugene OR, United States of America
LAL, Universit´e Paris-Sud and CNRS/IN2P3, Orsay, France
Graduate School of Science, Osaka University, Osaka, Japan
Department of Physics, University of Oslo, Oslo, Norway
Department of Physics, Oxford University, Oxford, United Kingdom
120 ( a ) INFN Sezione di Pavia; ( b ) Dipartimento di Fisica, Universit`a di Pavia, Pavia, Italy
Department of Physics, University of Pennsylvania, Philadelphia PA, United States of America
Petersburg Nuclear Physics Institute, Gatchina, Russia
123 ( a ) INFN Sezione di Pisa; ( b ) Dipartimento di Fisica E. Fermi, Universit`a di Pisa, Pisa, Italy
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh PA, United States of America
125 ( a ) Laboratorio de Instrumentacao e Fisica Experimental de Particulas - LIP, Lisboa, Portugal; ( b ) Departamentode Fisica Teorica y del Cosmos and CAFPE, Universidad de Granada, Granada, Spain
Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
Czech Technical University in Prague, Praha, Czech Republic
Faculty of Mathematics and Physics, Charles University in Prague, Praha, Czech Republic
State Research Center Institute for High Energy Physics, Protvino, Russia
Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom
Physics Department, University of Regina, Regina SK, Canada
Ritsumeikan University, Kusatsu, Shiga, Japan
133 ( a ) INFN Sezione di Roma I; ( b ) Dipartimento di Fisica, Universit`a La Sapienza, Roma, Italy
134 ( a ) INFN Sezione di Roma Tor Vergata; ( b ) Dipartimento di Fisica, Universit`a di Roma Tor Vergata, Roma, Italy
135 ( a ) INFN Sezione di Roma Tre; ( b ) Dipartimento di Matematica e Fisica, Universit`a Roma Tre, Roma, Italy
136 ( a ) Facult´e des Sciences Ain Chock, R´eseau Universitaire de Physique des Hautes Energies - Universit´e HassanII, Casablanca; ( b ) Centre National de l’Energie des Sciences Techniques Nucleaires, Rabat; ( c ) Facult´e des SciencesSemlalia, Universit´e Cadi Ayyad, LPHEA-Marrakech; ( d ) Facult´e des Sciences, Universit´e Mohamed Premier andLPTPM, Oujda; ( e ) Facult´e des sciences, Universit´e Mohammed V-Agdal, Rabat, Morocco
DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers), CEA Saclay (Commissariat `al’Energie Atomique et aux Energies Alternatives), Gif-sur-Yvette, France
Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz CA, United States ofAmerica
Department of Physics, University of Washington, Seattle WA, United States of America
Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom
Department of Physics, Shinshu University, Nagano, Japan
Fachbereich Physik, Universit¨at Siegen, Siegen, Germany
Department of Physics, Simon Fraser University, Burnaby BC, Canada
SLAC National Accelerator Laboratory, Stanford CA, United States of America3
145 ( a ) Faculty of Mathematics, Physics & Informatics, Comenius University, Bratislava; ( b ) Department ofSubnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak Republic
146 ( a ) Department of Physics, University of Cape Town, Cape Town; ( b ) Department of Physics, University ofJohannesburg, Johannesburg; ( c ) School of Physics, University of the Witwatersrand, Johannesburg, South Africa
147 ( a ) Department of Physics, Stockholm University; ( b ) The Oskar Klein Centre, Stockholm, Sweden
Physics Department, Royal Institute of Technology, Stockholm, Sweden
Departments of Physics & Astronomy and Chemistry, Stony Brook University, Stony Brook NY, United Statesof America
Department of Physics and Astronomy, University of Sussex, Brighton, United Kingdom
School of Physics, University of Sydney, Sydney, Australia
Institute of Physics, Academia Sinica, Taipei, Taiwan
Department of Physics, Technion: Israel Institute of Technology, Haifa, Israel
Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
International Center for Elementary Particle Physics and Department of Physics, The University of Tokyo,Tokyo, Japan
Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo, Japan
Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
Department of Physics, University of Toronto, Toronto ON, Canada
160 ( a ) TRIUMF, Vancouver BC; ( b ) Department of Physics and Astronomy, York University, Toronto ON, Canada
Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
Department of Physics and Astronomy, Tufts University, Medford MA, United States of America
Centro de Investigaciones, Universidad Antonio Narino, Bogota, Colombia
Department of Physics and Astronomy, University of California Irvine, Irvine CA, United States of America
165 ( a ) INFN Gruppo Collegato di Udine; ( b ) ICTP, Trieste; ( c ) Dipartimento di Chimica, Fisica e Ambiente,Universit`a di Udine, Udine, Italy
Department of Physics, University of Illinois, Urbana IL, United States of America
Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden
Instituto de F´ısica Corpuscular (IFIC) and Departamento de F´ısica At´omica, Molecular y Nuclear andDepartamento de Ingenier´ıa Electr´onica and Instituto de Microelectr´onica de Barcelona (IMB-CNM), University ofValencia and CSIC, Valencia, Spain
Department of Physics, University of British Columbia, Vancouver BC, Canada
Department of Physics and Astronomy, University of Victoria, Victoria BC, Canada
Department of Physics, University of Warwick, Coventry, United Kingdom
Waseda University, Tokyo, Japan
Department of Particle Physics, The Weizmann Institute of Science, Rehovot, Israel
Department of Physics, University of Wisconsin, Madison WI, United States of America
Fakult¨at f¨ur Physik und Astronomie, Julius-Maximilians-Universit¨at, W¨urzburg, Germany
Fachbereich C Physik, Bergische Universit¨at Wuppertal, Wuppertal, Germany
Department of Physics, Yale University, New Haven CT, United States of America
Yerevan Physics Institute, Yerevan, Armenia
Centre de Calcul de l’Institut National de Physique Nucl´eaire et de Physique des Particules (IN2P3),Villeurbanne, France a Also at Department of Physics, King’s College London, London, United Kingdom b Also at Laboratorio de Instrumentacao e Fisica Experimental de Particulas - LIP, Lisboa, Portugal c Also at Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan d Also at Faculdade de Ciencias and CFNUL, Universidade de Lisboa, Lisboa, Portugal e Also at Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United Kingdom f Also at TRIUMF, Vancouver BC, Canada g Also at Department of Physics, California State University, Fresno CA, United States of America h Also at Novosibirsk State University, Novosibirsk, Russia i Also at Department of Physics, University of Coimbra, Coimbra, Portugal j Also at Universit`a di Napoli Parthenope, Napoli, Italy k Also at Institute of Particle Physics (IPP), Canada l Also at Department of Physics, Middle East Technical University, Ankara, Turkey m Also at Louisiana Tech University, Ruston LA, United States of America n Also at Dep Fisica and CEFITEC of Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, Caparica,Portugal4 o Also at CPPM, Aix-Marseille Universit´e and CNRS/IN2P3, Marseille, France p Also at Department of Physics and Astronomy, Michigan State University, East Lansing MI, United States ofAmerica q Also at Department of Financial and Management Engineering, University of the Aegean, Chios, Greece r Also at Institucio Catalana de Recerca i Estudis Avancats, ICREA, Barcelona, Spain s Also at Department of Physics, University of Cape Town, Cape Town, South Africa t Also at CERN, Geneva, Switzerland u Also at Ochadai Academic Production, Ochanomizu University, Tokyo, Japan v Also at Manhattan College, New York NY, United States of America w Also at Institute of Physics, Academia Sinica, Taipei, Taiwan x Also at School of Physics and Engineering, Sun Yat-sen University, Guanzhou, China y Also at Academia Sinica Grid Computing, Institute of Physics, Academia Sinica, Taipei, Taiwan z Also at Laboratoire de Physique Nucl´eaire et de Hautes Energies, UPMC and Universit´e Paris-Diderot andCNRS/IN2P3, Paris, France aa Also at School of Physical Sciences, National Institute of Science Education and Research, Bhubaneswar, India ab Also at Dipartimento di Fisica, Universit`a La Sapienza, Roma, Italy ac Also at DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l’Univers), CEA Saclay (Commissariat`a l’Energie Atomique et aux Energies Alternatives), Gif-sur-Yvette, France ad Also at Moscow Institute of Physics and Technology State University, Dolgoprudny, Russia ae Also at Section de Physique, Universit´e de Gen`eve, Geneva, Switzerland af Also at Departamento de Fisica, Universidade de Minho, Braga, Portugal ag Also at Department of Physics, The University of Texas at Austin, Austin TX, United States of America ah Also at Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Budapest, Hungary ai Also at DESY, Hamburg and Zeuthen, Germany aj Also at International School for Advanced Studies (SISSA), Trieste, Italy ak Also at Department of Physics and Astronomy, University of South Carolina, Columbia SC, United States ofAmerica al Also at Faculty of Physics, M.V.Lomonosov Moscow State University, Moscow, Russia am Also at Nevis Laboratory, Columbia University, Irvington NY, United States of America an Also at Physics Department, Brookhaven National Laboratory, Upton NY, United States of America ao Also at Moscow Engineering and Physics Institute (MEPhI), Moscow, Russia ap Also at Department of Physics, Oxford University, Oxford, United Kingdom aq Also at Institut f¨ur Experimentalphysik, Universit¨at Hamburg, Hamburg, Germany ar Also at Department of Physics, The University of Michigan, Ann Arbor MI, United States of America as Also at Discipline of Physics, University of KwaZulu-Natal, Durban, South Africa ∗∗