aa r X i v : . [ h e p - e x ] D ec SNSN-323-63December 7, 2016
Latest ATLAS results from Run 2
Claudia Gemme
Istituto Nazionale di Fisica NucleareGenova, ITALY on behalf of the ATLAS Collaboration
After the first LHC long shutdown with upgrades to the machine andthe detectors, since 2015 the ATLAS experiment recorded more than30 fb − of integrated luminosity of pp collision data at 13 TeV centre-of-mass energy. The data collected to date, the detector and physics per-formance, and measurements of Standard Model processes are reviewedbriefly before summarising the latest ATLAS results in the Brout- Englert-Higgs sector, where substantial progress has been made since the discov-ery. Searches for physics phenomena beyond the Standard Model are alsosummarized. These proceedings reflect only a brief summary of the ma-terial presented at the conference.PRESENTED AT Introduction
After the first succesful data taking period in 2010-2012 (Run 1), the ATLAS detec-tor [1] has been significantly improved during the LHC long shutdown in 2013-2014with a new beam pipe and a 4th silicon pixel layer (IBL) at 3.3 cm from the interac-tion point; improvements in the magnetic and cryogenic systems; consolidation andrepairs of all subsdetectors; upgrade in the trigger and data acquisistion systems in-creasing the maximum first level hardware rate from 75 kHz to 100 kHz and mergingthe two software trigger levels. The ATLAS experiment has had a successful start of pp data taking at 13 TeV (Run 2) with 3.9 fb − collision data recorded in 2015, witha DAQ efficiency of 92%. In 2016, 27.1 fb − of pp collision data were recorded bythe time of this conference, with very high efficiency. The peak luminosity deliveredby LHC was 1.37 × cm − s − , greater than the design value of 1 × cm − s − . The status of the detector is excellent, with close to 100% of readout channelsavailable across all sub-detectors. Luminosity Block [~ 60s]200 400 600 800 1000 1200 1400 1600 L1 T r i gge r R a t e [ k H z ] L1 Trigger Total OutputSingle MUONMulti MUONSingle EMMulti EMSingle JETMulti JETMissing Trans. EnergyTAUCombined
ATLAS
Trigger OperationL1 Group Rates (with overlaps)= 13 TeVspp Data July 2016, Luminosity Block [~ 60s]200 400 600 800 1000 1200 1400 1600 H L T T r i gge r R a t e [ H z ] Main Physics StreamSingle MuonsMulti MuonsSingle ElectronsMulti ElectronsSingle JetMulti Jetsb-JetsMissing Trans. EnergyTausPhotonsB-PhysicsCombined Objects
ATLAS
Trigger OperationHLT Physics Group Rates(with overlaps) = 13 TeVspp Data July 2016,
Figure 1: Left: Physics trigger group rates at the first trigger level (L1) for one fillas a function of the luminosity block number. Each luminosity block corresponds onaverage to 60 s. The fill was taken in July 2016 with a peak luminosity of 1 . × cm − s − and a peak pile-up of 35. Presented are the rates of the individual L1trigger groups for various L1 trigger physics objects. Overlaps are accounted for inthe total output rate, but not in the individual groups, leading to a higher recordingrate compared to the total L1 output rate. Right: Same as on the left, but physicstrigger group rates at the High Level Trigger (HLT). [2]The improvements in the event selection and readout systems have allowed facingthe 2016 conditions, with a complex trigger menu designed to meet varied physics,monitoring and performance requirements. As can be seen in Fig. 1 for a typical LHCfill, most of the bandwidth of the first level hardware (L1) and High Level Triggersoftware (HLT) rates is still given to generic triggers, such as single isolated leptons,complemented by multi-object triggers and triggers dedicated to specific analyses.1he average physics output rate is ∼ b -jets, missing energy, etc. A detailed understanding of the Standard Model (SM) processes is essential for theATLAS physics program. While looking for possible deviations from SM predictions,they represent a key ingredient for the description of the backgrounds and MonteCarlo models in the new physics searches, which are pushing into increasingly intricateevent signatures. An overview of such cross-section measurements is shown in Fig. 2. pp total(x2)inelastic Jets R =0.4 n j ≥ < p T < TeVn j ≥ < m jj < γ fid. p T > p T > W fid.n j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ Z fid.n j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ j ≥ t¯t fid.totaln j ≥ j ≥ j ≥ j ≥ j ≥ t tot. s -chan t -chan Wt VV tot. ZZWZWW ZZWZWW ZZWZWW γγ fid. H fid. H → γγ VBF H → WW ggF H → WWH → ZZ → ℓ H → ττ total V γ fid. Z γ Z γ W γ t¯tW tot. t¯tZ tot. t¯t γ fid. Zjj
EWK fid. WW Excl. tot. Z γγ fid. W γγ fid. VVjj
EWK fid. W ± W ± WZ σ [ pb ] − − − Theory
LHCpp √ s =7 TeV
Data − fb − LHCpp √ s =8 TeV
Data fb − LHCpp √ s =13 TeV
Data − fb − Standard Model Production Cross Section Measurements
Status:August2016
ATLAS
PreliminaryRun 1,2 √ s = 7, 8, 13 TeV
Figure 2: Overview of cross-section measurements of selected Standard Model pro-cesses compared to the corresponding theoretical expectations [3]. All theoreticalexpectations were calculated at NLO or higher.The measurements of Z production in association with jets [4] and massive dibosonproduction [5] were briefy mentioned at the conference, and the interested reader isreferred to the ATLAS results web page, as well as to specific references. These arejust two examples demonstrating as accurate predictions from different Monte Carlogenerators are needed to face the challenge of the precision of LHC data.2 .1 Higgs Boson measurements In July 2012, the ATLAS and CMS collaborations announced the discovery of a Higgsboson [6, 7] using pp collision data collected at centre-of-mass energies √ s = 7 TeVand 8 TeV at the LHC. Using the full Run 1 statistics, ATLAS and CMS havesummarized their measurement in combined legacy papers [8, 9]. The Higgs bo-son mass is measured in the H → γγ and H → ZZ ∗ → l decay channels. Theresults are obtained from a simultaneous fit to the reconstructed invariant masspeaks in the two channels and for the two experiments. The measured massesfrom the individual channels and the two experiments are found to be consistentamong themselves. The combined measured mass of the Higgs boson is m H =125 . ± . . ) ± . . ) GeV [8]. Combined ATLAS and CMS measure-ments of the Higgs boson production and decay rates, as well as constraints on itscouplings to vector bosons and fermions, are summarized in [9]. The combined signalyield relative to the Standard Model prediction is measured to be 1 . ± .
11. Thecombined measurements lead to observed significances for the vector boson fusionproduction process and for the H → τ τ decay of 5.4 and 5.5 standard deviations,respectively. Most couplings measurements are consistent with the SM predictionswithin 2 σ . The largest observed deviation is the ratio σ ttH /σ ggF at 3.0 standarddeviations to the SM.More studies have been performed using 2015 and 2016 data at √ s = 13 TeV. Thefirst priority has been the “rediscovery” of the Higgs boson at the larger centre-of-massenergy. The analysis [10] is based on the measurements performed in the individual H → γγ and H → ZZ ∗ decay channels. Higgs boson production is observed in the13 TeV dataset with a local significance of about 10 (8.6 expected), and evidence forproduction via vector boson fusion is seen with a local significance of about 4 (1.9expected). The total pp → H + X cross-sections at centre-of-mass energies of 7, 8and 13 TeV measured in these two decay channels are shown in Figure 3, along withtheir combination and the comparison to theoretical predictions. The cross-section σ ( pp → H + X , 13 TeV) is 59 . +9 . − . (stat . ) +4 . − . (syst . ) pb, while the SM prediction is55 . +2 . − . pb.The other Run 2 priorities are the refining of Higgs properties as couplings andmass; the search of ttH production; the search for H → bb decay (described below);the search for rare decays; the use of the Higgs boson as a tool to observe new physics.The decay with the largest predicted branching fraction (58%) for a SM Higgs bo-son of mass 125 GeV is H → bb . However at the LHC the overwhelming backgroundsarising from multi-jet production make a fully inclusive search extremely challenging.The production modes where the Higgs boson is produced together with a W or Z boson provide a promising alternative despite having a cross-section more than anorder of magnitude lower than the dominant gluon-gluon fusion production mode.The leptonic decays of the W and Z boson lead to relatively clean signatures that3 (cid:0)✁✂✄s✼ ✽ ✾ ✶☎ ✶✶ ✶✆ ✶✝✞✟✠✡ ❍➤♣♣☛ ☎✆☎✹☎✻☎✽☎✶☎☎ ❆☞✌❆✍ ✥✎✏✑✒✓✒✔✕✎✖ ✗ ✘✙✚✛✜✢ ✣✤✦✧♠★✩✪✪✫◗✬✭ ✮✯✰✱✲ ✳✴✯✲✵✷✰✸✴✷✺ ✿❀❛❁❂❃❄➴❅❇❈❉❊❋❚●■❏ ❑▲▼◆❖■❏❣❣P❘ ❧❙P❯❩❩P❘❝❱❲❳❨ ❭❪❫❪ ❴❵❴❫❨ ❜❞❝❨ ➢❡❢ ❤ ❚◆✐❥ ❦❏♥ ♦qr ➢❡❢ t ❚◆✐❥ ✉✈❏✇ ♦qr ①②③③④➢❡②❥ ⑤❦❏t ♦q⑥⑥④➢❡❢ ⑤✇ ❚◆✐❥ ⑤✇❏✇ ♦qr Figure 3: Total pp → H + X cross-sections measured at different centre-of-massenergies compared to Standard Model predictions at up to N LO in QCD [10].can be used to significantly suppress the contributions from background processes andallow for an efficient triggering strategy. The LHC combination of the Run 1 ATLASand CMS analyses resulted in observed (expected) significances of 2.6 (3.7) standarddeviations [9], therefore one of the main priorities for Run 2 is the measurement ofthe coupling with the b quark.A search for the decay of a Standard Model Higgs boson into a bb pair whenproduced in association with a W or Z boson has been performed using the datacollected in proton-proton collisions from Run 2 at a centre-of-mass energy of 13TeV, corresponding to an integrated luminosity of 13.2 fb − [11]. Considered finalstates contain 0, 1 and 2 charged leptons (electrons or muons), targeting the decays: Z → νν , W → lν , and Z → ll . For m H = 125 GeV the ratio of the measured signalstrength to the SM expectation is found to be µ = 0 . +0 . − . (stat . ) ± . . ).This corresponds to an observed significance of 0.42 standard deviations comparedwith an expected sensitivity of 1.94. The analysis procedure has been validated bymeasuring the yield of ( W/Z ) Z with Z → bb , where the ratio of the observed yield tothat expected in the Standard Model was found to be 0 . ± . . ) +0 . − . (syst . ),corresponding to a significance of 3.0 standard deviations compared to an expectedsignificance of 3.2. A huge range of searches for physics beyond the Standard Model (BSM) have beenperformed by ATLAS, looking for new sequential bosons and fermions, new vector-likequarks, signals for extra dimensions, supersymmetric (SUSY) models, technicolour,4nd so on. No evidence for new beyond-the-Standard Model physics was observedat either 7 or 8 TeV centre-of-mass energy. The Run 2 dataset represents the pos-sibility for a major extension of reach compared to Run 1 thanks to the enhancedcross-sections at the larger energy. A very brief summary of some recent results isgiven.
Diboson resonances
Extensions of the SM predict the existence of new particles that may decay intovector-boson pairs, such as heavy neutral Higgs (spin 0), Heavy Vector Triplet W(spin 1), Bulk Randall-Sundrum Graviton G* (spin 2). Results from the search forresonances with masses above 1 TeV decaying to the diboson final states,
W W , W Z and ZZ , in the fully-hadronic channel are reported [12]. Hadronic decays of the highlyboosted W and Z bosons emerging from the decay of a heavy resonance are recon-structed within a single large-radius jet, and jet substructure properties are used toselect jets consistent with boson decays. This selection strongly suppresses the largebackgrounds due to SM multi-jet events. No significant excess is observed in theanalyzed data set and exclusion limits are set. Diphoton resonances
Using the 2015 data, searches for new resonances decaying into two photons observeda deviation from the Standard Model background-only hypothesis corresponding to3.9 standard deviations for a resonance spin-0 mass hypothesis of 730 GeV [13], see
200 400 600 800 1000 1200 1400 1600 1800 2000 E v en t s / G e V −
10 110 ATLAS
Spin-0 Selection -1 = 13 TeV, 3.2 fbs DataBackground-only fit [GeV] γγ m200 400 600 800 1000 1200 1400 1600 1800 2000 D a t a - f i tt ed ba ck g r ound − − [GeV] X m Lo c a l p - v a l ue − − − − −
10 1
ATLAS
Preliminary -1 =13 TeV, 15.4 fbsSpin-0 Selection, γγ → X = 6 % X m/ X Γ ) -1 -1 σ σ σ σ σ Figure 4: Left: Invariant-mass distribution of the selected diphoton candidates, withthe background-only fit overlaid, obtained with 2015 data; the difference between thedata and this fit is shown in the bottom panel [13]. Right: Compatibility with thebackground-only hypothesis as a function of the assumed signal mass with the fulldata set [14]. 5ig. 4 left. The excess is not confirmed in 2016 data with a four times larger statistics[14]: in the 700-800 GeV mass range the largest local significance is 2.3 standard de-viations for a mass near 710 GeV and a relative width of 10%. The global significanceof these excesses is less than one standard deviation, see Fig. 4 right.
Dilepton resonances
The dielectron and dimuon final-state signature has excellent sensitivity to a widevariety of new phenomena expected in theories beyond the Standard Model. It bene-fits from high signal selection efficiencies and relatively small, well-understood back-grounds. The observed dilepton invariant mass spectrum is consistent with the Stan-dard Model prediction, within systematic and statistical uncertainties [15]. Similarlya search for W ′ bosons decaying to a charged lepton (electron or muon) and a neu-trino have been performed [16]. The transverse mass distribution is examined and nosignificant excess above Standard Model predictions is observed. In both cases lowerlimits on a resonance mass are set, enhancing the reach with respect to Run 1 of morethan 1 TeV. SUSY searches
Supersymmetry (SUSY) is a generalization of space-time symmetries that predictsnew bosonic partners for the fermions and new fermionic partners for the bosons ofthe Standard Model and that provides a natural solution to the hierarchy problem.The large expected cross-sections predicted for the strong production of supersym-metric particles make the production of gluinos and squarks the primary target forearly searches for SUSY in pp collisions at a centre-of-mass energy of 13 TeV at theLHC.As an example [17] results were reported of a search for supersymmetric particle pro-duction that could be observed in high-energy proton-proton collisions: events withlarge numbers of jets, together with missing transverse momentum from unobservedparticles, are selected. The search selects events with various jet multiplicities from8 to 10 jets, and with various requirements on the sum of masses of large-radiusreclustered jets. In contrast to many other searches for the production of stronglyinteracting SUSY particles in the hadronic channel, the requirement made of large jetmultiplicity implies that the threshold on missing energy can be modest. No excessabove Standard Model expectations is observed. The results are interpreted withintwo supersymmetry models, where gluino masses up to 1600 GeV are excluded at95% confidence level, extending previous limits. Searches summary
At the time of the conference ∼
50% of the search analyses were updated to the newRun 2 energy. In general the data agree well with the background expectations, sosignificant increase in excluded BSM particle mass ranges has been set. Figures 5 and6 show the reach of ATLAS searches for Supersymmetry and other new phenomena.6 ♦❞❡❧ (cid:0)❀✖❀✜❀✌ ❏❡ts ❊♠✐✁✁❚ ❘▲✂✄❬❢❜☎✶❪ ▼❛ss❧✆✝✆t ✞❡✟❡r❡♥❝❡■✠✡☛✉☞✍✈✎❙✎✏✑✡❤✎☞✸✒✓❣✎✠✳ ➌✔✕✎✗✳✘✙✚✛✢✣✤✥q✦✧★❦✥ ✩✪★✢✫✬♣★✭✩✦✫✬✪✭✣✮❲ ✗✍✑✎✡✯✰✱✠❣✲☛✍✈✎✗ ✴✏✑✯✍✡☛✎☞✵P❱❖✷✹✺✻ ✼✽❯●✾❆✿❈✼✽✽✼ ❁❂❃❄❅❇✿❉❂❋❍ ❋❂❉❁❥❑◆◗✿❃❳ ❨❑◗ ❋❁❩❃ ❭❫❴❵✇①❭❫❴②✇ ③④⑤⑥⑦⑤④④⑧④⑨⑩❶❷❸❹❺❻❼❽❻❾❿➀❿➀➁❿➀➂➀❿➃➄➅ ❁ ❋❂➆❥❑◆◗ ❨❑◗ ❉❃❩❃ ❭❫❴➇➈➉✇➊⑧⑤⑤➋➍➎➏❭❫➐➑➒➓➔→➣❴↔✇①❭❫↕➙➛➓➔→➣❴↔✇ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤⑥➧⑨⑩➨❷❸❹❺❻❼❿➀❿➀➁❿➀➂➀❿➃➄➅➩➫➭➯➲➳❑◗◗❑➵➸ ➯➭➺➭❂❥❑◆ ❉❂❃❥❑◆◗ ❨❑◗ ❃❩❋ ❭❫❴❵✇➠❭❫❴➇➈➉✇➊④➋➍➎ ③➦⑤➻⑦⑤⑥⑥⑥➼➽➾❶➚❹❺❻❼❿➪❿➪➁❿➪➂➀➶➀❿➃➄➅ ❁ ❋❂➆❥❑◆◗ ❨❑◗ ❉❃❩❃ ❭❫❴➇➈➉✇➹⑤➋➍➎ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤⑥➧⑨⑩❶➽❸❹❺❻❾❿➪❿➪➁❿➪➂➀➀❿➃➘➅➂➀➀➴➘❿➃➄➅ ❁ ❋❂➆❥❑◆◗ ❨❑◗ ❉❃❩❃ ❭❫❴➇➈➉✇➊➻⑤⑤➋➍➎➏❭❫❴➇➷✇①⑤⑦④❫❭❫❴➇➈➉✇➬❭❫❴②✇✇ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤⑥➧⑨⑩❶➨❸❹❺❻❾❿➪❿➪➁❿➪➂➀➀➮➱➱✃❐❐❒❿➃➄➅ ❃❄❅❇ ❮❥❑◆◗ ❂ ❉❃❩❋ ❭❫❴➇➈➉✇➊➻⑤⑤➋➍➎ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤➼⑥⑨⑩❰❸❹❺❻❾❿➪❿➪➁❿➪➂➀➀➴Ï❿➃➄➅ ❋❄❅❇➩✽✽➸ ❁❂❃❥❑◆◗ ❨❑◗ ❉❃❩❋ ❭❫❴➇➈➉✇➊④⑤⑤➋➍➎ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤➼⑥⑨⑩➽❸❹❺❻❾●✼✽Ð➩❿➱ÑÒ✽Ó➸ ❉❂❋❍Ô❁❂❉➱ ❁❂❋❥❑◆◗ ❨❑◗ ❃❩❋ ③➦⑤⑥⑦⑤④Õ⑥ÕÖ⑩➾❸❹❺❻❾●●✼➩×Ø➺➭ÑÒ✽Ó➸ ❋Ù ❂ ❨❑◗ ❃❩❋ ÚÛ❫➤➞➟Ü✇➊⑤⑦③❭❭ ③➦⑤➦⑦⑤Õ③④⑤⑨⑩➽❷❸❹❺❻❾●●✼➩ÝØÞÞ◗Ø➺➭❂×Ø➺➭ÑÒ✽Ó➸ Ù ❉❳ ❨❑◗ ❋❁❩❃ ❭❫❴➇➈➉✇➊Õ④⑤➋➍➎➏ÚÛ❫➤➞➟Ü✇➊⑤⑦③❭❭➏ß➊⑤ ③④⑤⑥⑦⑤④➻Õ➼⑨⑩➨❰❸❹❺❻❾●●✼➩ÝØÞÞ◗Ø➺➭❂×Ø➺➭ÑÒ✽Ó➸ Ù ❋❥❑◆◗ ❨❑◗ ❉❃❩❃ ❭❫❴➇➈➉✇à➦➧⑤➋➍➎➏ÚÛ❫➤➞➟Ü✇➊⑤⑦③❭❭➏ßà⑤ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤➦➦⑨⑩❶❸❹❺❻❾●●✼➩ÝØÞÞ◗Ø➺➭ÑÒ✽Ó➸ ❋❄❅❇➩Ï➸ ❋❥❑◆◗ ❨❑◗ ❋❁❩❃ ❭❫➤➞➟Ü✇à➻➼⑤➋➍➎ ③④⑤➼⑦⑤➼⑧Õ⑤á➾➾➚❹❺❻❾●➳âãØ◆Ø➺➭Ò✽Ó ❁ ➯➭➺➭❂❥❑◆ ❨❑◗ ❋❁❩❃ ❭❫❴ä✇à➐➣åæ➐çèé➍➎➏❭❫❴②✇➹❭❫❴❵✇➹③⑦④➝➍➎ ③④⑤⑧⑦⑤③④③➧❶➽❷➚❹❺êëìíîïðñ➍❿➪❿➪➁❿➪➂❳➶❳❿➃➄➅ ❁ ❃❳ ❨❑◗ ❉❮❩ò ❭❫❴➇➈➉✇➹⑤➋➍➎ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤④⑧⑨⑩❶á❸❹❺❻❾❿➪❿➪➁❿➪➂ó➶ó❿➃➄➅ ❁❂❉❄❅❇ ❃❳ ❨❑◗ ❉❮❩ò ❭❫❴➇➈➉✇➹⑤➋➍➎ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤④⑧⑨⑩❶á❸❹❺❻❾❿➪❿➪➁❿➪➂❳➶ó❿➃ô➅ ❁❂❉❄❅❇ ❃❳ ❨❑◗ ❋❁❩❉ ❭❫❴➇➈➉✇➊➼⑤⑤➋➍➎ ③➻⑤⑥⑦⑤➦⑤⑤⑨⑩➨❰❸❹❺❻❾❿❳➅❿❳➅➁❿❳➅➂❳❿➃➄➅ ❁ ❋❳ ❨❑◗ ❃❩❋ ❭❫❴➇➈➉✇➊③⑤⑤➋➍➎ ③➦⑤➦⑦⑤➧⑥⑥⑧❶õ➾➚❹❺❻öë❿❳➅❿❳➅➁❿❳➅➂ó❿➃➘➅ ❋❄❅❇➩✽✽➸ ❉❳ ❨❑◗ ❉❃❩❋ ❭❫❴➇➈➉✇➊③④⑤➋➍➎➏❭❫❴➇➷➉✇①❭❫❴➇➈➉✇➬③⑤⑤➋➍➎ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤➼⑥➨Ö❷÷➽❶❷➚❹❺❻öë❿ó➅❿ó➅➁❿ó➅➂❳❿➃➘➅ ❁❂❋❄❅❇ ❉❂❋❳ ❨❑◗❮❩ø✿❉❃❩❃ ❭❫❴➇➷➉✇①⑧❭❫❴➇➈➉✇➏❭❫❴➇➈➉✇①④④➋➍➎ ③⑧⑤Õ⑦⑧③⑤⑧➏➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤⑥⑥⑨⑨❰÷⑨❰➾➚❹❺❻ùë Ö➾➾÷❰Ö➾➚❹❺❻ùë❿ó➅❿ó➅➁❿ó➅➂➴❳❿➃➄➅➭➳ó❿➃➄➅ ❁❂❋❄❅❇ ❁❂❋❥❑◆◗✿❉❂❋❳ ❨❑◗❮❩ø✿❉❃❩❃ ❭❫❴➇➈➉✇①③➋➍➎ ③④⑤➦⑦⑤➧➦③➦➏➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤⑥⑥á➾÷⑨á❶➚❹❺❻ùë Ö➾❷÷❶❷➾➚❹❺❻ùë❿ó➅❿ó➅➁❿ó➅➂ú❿➃➄➅ ❁ ➯➭➺➭❂❥❑◆ ❨❑◗ ❃❩❋ ❭❫❴û➉✇➠❭❫❴➇➈➉✇➹④➋➍➎ ③➦⑤➻⑦⑤⑥⑥⑥➼á➾÷➨Ö➨➚❹❺❻ùë❿ó➅❿ó➅➩➺â◆ü➳âý●✼✽Ð➸ ❋❄❅❇➩Ï➸ ❉❳ ❨❑◗ ❋❁❩❃ ❭❫❴➇➈➉✇à③④⑤➋➍➎ ③➻⑤➼⑦④⑧⑧⑧⑨❷➾÷➽➾➾➚❹❺❻ùë❿óþ❿óþ➁❿óþ➂❿ó➅ÿÏ ❃❄❅❇➩Ï➸ ❉❳ ❨❑◗ ❉❃❩❃ ❭❫❴➇➈➉✇➊➼⑤⑤➋➍➎ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤➼➧Öá➾÷❰➾➾➚❹❺❻ùí❿óþ❿óþ➁❿óþ➂❿ó➅ÿ❤ ❉❄❅❇ ➆❥❑◆◗Ô❋❳ ❨❑◗ ❋❁❩❃ ❭❫❴➇➈➉✇➹⑤➋➍➎ ③④⑤➦⑦⑤➧➦③➦➨Ö➾÷➽Ö➾➚❹❺❻ùí❿➱▲❀❘❿➱▲❀❘➁❿➱➂➱❿➃➄➅ ❋❄❅❇ ❁ ❨❑◗ ❋❁❩❃ ❭❫❴➇➈➉✇①⑤➋➍➎ ③➻⑤➼⑦④⑧Õ➻á➾÷➨➨❷➚❹❺❻❵❿➃ô➅❿➃(cid:0)➅➁❿➃ô➅➂❿➱❐➮➱❿❐❒ ❋❄❅❇ ❁ ❨❑◗ ❉❃❩❃ ❭❫❴➇➈➉✇①⑤➋➍➎➏❭❫❴✁✂❴✗✇①⑤⑦④❫❭❫❴➇➷➉✇➬❭❫❴➇➈➉✇✇ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤Õ➦➽õ➾➚❹❺❻✤✝ë❿➃ô➅❿➃(cid:0)➅➁❿➃ô➅➂❿❍❐➮❍❿❐❒ ❋❍ ❂ ❨❑◗ ❉❮❩ò ❭❫❴➇➈➉✇①⑤➋➍➎➏❭❫❴Û✂❴✗✇①⑤⑦④❫❭❫❴➇➷➉✇➬❭❫❴➇➈➉✇✇ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤Õ➼❷❶➾➚❹❺❻✤✝ë❿➃➘➅❿➃➄þ➂❿➱▲❐❿➱▲➱➮❿❐❐❒❅➱❿❐❿➱▲➱➮❿❐❐❒ ❃❄❅❇ ❁ ❨❑◗ ❉❃❩❃ ❭❫❴➇➷➉✇①❭❫❴➇➈✷✇➏❭❫❴➇➈➉✇①⑤➏❭❫❴✁✂❴✗✇①⑤⑦④❫❭❫❴➇➷➉✇➬❭❫❴➇➈➉✇✇ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤Õ➦⑨⑩➾❸❹❺❻✤✝ë❽❻✤✵í❿➃➘➅❿➃➄þ➂➴❿➃➄➅Ï❿➃➄➅ ❋❂❃❄❅❇ ❁❂❋❥❑◆◗ ❨❑◗ ❋❁❩❃ ❭❫❴➇➷➉✇①❭❫❴➇➈✷✇➏❭❫❴➇➈➉✇①⑤➏❴✁❞➍ï♦✉♣ñ➍❞ ③➻⑤➼⑦④⑧Õ➻➏③➻⑤⑧⑦⑥⑤⑧ÕõÖ❷➚❹❺❻✤✝ë❽❻✤✵í❿➃➘➅❿➃➄þ➂➴❿➃➄➅❤❿➃➄➅➁❤➂❳➶❳✃➴➴✃❍❍✃ÙÙ ❄❅❇❅Ù ❁❂❋❳ ❨❑◗ ❋❁❩❃ ❭❫❴➇➷➉✇①❭❫❴➇➈✷✇➏❭❫❴➇➈➉✇①⑤➏❴✁❞➍ï♦✉♣ñ➍❞ ③④⑤③⑦⑤⑥③③⑤Ö❰➾➚❹❺❻✤✝ë❽❻✤✵í❿➃➄þ❿➃➄✸➁❿➃➄þ❀✸➂❿➱❘➱ ❮❄❅❇ ❁ ❨❑◗ ❋❁❩❃ ❭❫❴➇➈✷✇①❭❫❴➇➈✄✇➏❭❫❴➇➈➉✇①⑤➏❭❫❴✁✂❴✗✇①⑤⑦④❫❭❫❴➇➈✷✇➬❭❫❴➇➈➉✇✇ ③➻⑤④⑦④⑤➧➦➽➨❷➚❹❺❻✤✵í☎✆●●✼➩✇Ø➺➭ÑÒ✽Ó➸✇❑â❦➲➳➭➵❩ ❉❄❅❇ÔÙ ❂ ❨❑◗ ❋❁❩❃ ÚÛ➊③❭❭ ③④⑤⑥⑦⑤④➻Õ➼⑨⑨❷÷➨❰➾➚❹❺❻❲●●✼➩×Ø➺➭ÑÒ✽Ó➸✇❑â❦➲➳➭➵❩ ❋Ù ❂ ❨❑◗ ❋❁❩❃ ÚÛ➊③❭❭ ③④⑤⑥⑦⑤④➻Õ➼❷á➾➚❹❺❻❲❉Ø➳❑➫◆❿➃ô➅❿➃(cid:0)➅➲➳➭➵❩➁ý➭➺Þ❂ýØã❑➵❿➃➘➅ ❉Ø◗â➲➲❩◆➳❦ ❉❥❑◆ ❨❑◗ ❋❁❩❃ ❭❫❴➇➷➉✇➠❭❫❴➇➈➉✇✘③➦⑤▼➍➎➏Û✭❴➇➷➉✮➹⑤⑦⑧♥î ③➼③⑤⑦➼➦⑥④Ö❰➾➚❹❺❻✤✝ë❉Ø➳❑➫◆❿➃ô➅❿➃(cid:0)➅➲➳➭➵❩➁ý➭➺Þ❂ýØã❑➵❿➃➘➅ ➵❊✿➵①◆➳❦ ❂ ❨❑◗ ❉ò❩❮ ❭❫❴➇➷➉✇➠❭❫❴➇➈➉✇✘③➦⑤▼➍➎➏Û✭❴➇➷➉✮➊③④♥î ③④⑤➦⑦⑤④➼➼⑧õá❷➚❹❺❻✤✝ë✽◆â×ý❑➁◗◆➭➲➲❑➵❿➪✾❂Ýâ➵➳➭➺ ❁ ❉❂✺❥❑◆◗ ❨❑◗ ❋ø❩✾ ❭❫❴➇➈➉✇①③⑤⑤➋➍➎➏③⑤ßî➊Û✭❴②✮➊③⑤⑤⑤î ③➼③⑤⑦➦④➧➻❶❷➾➚❹❺❻❾✽◆â×ý❑❿➪✾❂Ýâ➵➳➭➺ ◆➳❦ ❂ ❂ ❃❩❋ ③➦⑤➦⑦⑤④③⑧Õ⑨⑩❷❶❸❹❺❻❾✼❑◆â◗◆â×ý❑❿➪✾❂Ýâ➵➳➭➺ ➵❊✿➵①◆➳❦ ❂ ❂ ❃❩❋ ❭❫❴➇➈➉✇①③⑤⑤➋➍➎➏Ûà③⑤♥î ③➦⑤➻⑦⑤➻④⑧⑤⑨⑩❷❰❸❹❺❻❾●✼✽Ð➁◗◆â×ý❑❿❍➁❿➃➄➅➂❿❍➮❿❄❅❿❇❒Ô❍➮❄❅❇❒ ❉❂❋❇ ❂ ❂ ❉✾❩❉ ③⑤➊tð♥☞➊④⑤ ③➻③③⑦➦⑥Õ④❷➨❰➚❹❺❻✤✵ë●✼✽Ð➁❿➃➄➅➂Ù❿●➁ý➭➺Þ❂ýØã❑➵❿➃➄➅ ❋Ù ❂ ❨❑◗ ❋❁❩❃ ③➊Û✭❴➇➈➉✮➊➼♥î➏➟Ü➟➧❭♦❞➍ñ ③➻⑤Õ⑦④④➻⑧õõ➾➚❹❺❻✤✵ë❿➪❿➪➁❿➃➄➅➂❄❄❐✃❄❇❐✃❇❇❐ ➵Ø◗➲ý❩❄❄✃❄❇✃❇❇ ❂ ❂ ❋❁❩❃ ⑥➊ÚÛ✭❴➇➈➉✮➊⑥➻⑤❭❭➏❭❫❴②✇①③⑦➼➝➍➎ ③④⑤➻⑦⑤④③➦⑧⑨⑩➾❸❹❺❻✤✵ë●●✼❿➪❿➪➁❿➃➄➅➂Ï❿● ➵Ø◗➲ý❩ã◆①Ô❥❑◆◗ ❂ ❂ ❋❁❩❃ ➦➊ÚÛ✭❴➇➈➉✮➊➻➧⑤❭❭➏❭❫❴②✇①③⑦③➝➍➎ ③④⑤➻⑦⑤④③➦⑧⑨⑩➾❸❹❺❻✤✵ëÒ❋❱✞✞➂❿❐✜ÿ❳❅❿❐✜➂❄❇✃❄❍✃❇❍ ❄❇➁❄❍➁❇❍ ❂ ❂ ❃❩❋ ✕✟✄➉➉①⑤⑦③③➏✕➉✄✷❂➉✄✄❂✷✄✄①⑤⑦⑤⑥ ③➦⑤⑥⑦⑤➧⑤⑥Õ⑨⑩á❸❹❺❻✠✡ÐØýØ➺❑â➳✾Ó❱❈✼✽✽✼ ❋❄❅❇➩✽✽➸ ❁❂❃❳ ❨❑◗ ❋❁❩❃ ❭❫❴❵✇①❭❫❴②✇➏ÚÛ☛❙P➊③❭❭ ③➻⑤➻⑦⑧④⑤⑤⑨⑩õ❷❸❹❺❻❼➏❻❾❿➃ô➅❿➃(cid:0)➅➁❿➃ô➅➂➴❿➃➄➅❅❿➃➄➅➂❄❄❐❅❄❇❐❅❇❇❐ ❮❄❅❇ ❂ ❨❑◗ ❉❃❩❃ ❭❫❴➇➈➉✇à➻⑤⑤✌➔✍➏✕➉✷✎✱⑤❫✏➹➐✂↕✇ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤⑥④⑨⑩⑨õ❸❹❺❻✤✝ë❿➃ô➅❿➃(cid:0)➅➁❿➃ô➅➂➴❿➃➄➅❅❿➃➄➅➂❍❍❐❡❅❄❍❐✜ ❃❄❅❇Ô❍ ❂ ❨❑◗ ❋❁❩❃ ❭❫❴➇➈➉✇à⑤⑦⑧æ❭❫❴➇➷➉✇➏✕➉✄✄✱⑤ ③➻⑤④⑦④⑤➧➦õ❷➾➚❹❺❻✤✝ë❿➪❿➪➁❿➪➂➀➀➀ ❁ ❮❂✺ýâ➳Þ❑❂✑❥❑◆◗ ❂ ❉❮❩ò ❇✒❫û✇①❇✒❫❜✇①❇✒❫Ú✇①⑤✪ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤④⑥⑨⑩➾❶❸❹❺❻❾❿➪❿➪➁❿➪➂➀➀❿➃➄➅➁❿➃➄➅➂➀➀➀ ❁ ❮❂✺ýâ➳Þ❑❂✑❥❑◆◗ ❂ ❉❮❩ò ❭✭❴➇➈➉✇①➧⑤⑤➋➍➎ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤④⑥⑨⑩❷❷❸❹❺❻❾❿➪❿➪➁❿➪➂ó➶ó❿➃➄➅➁❿➃➄➅➂➀➀➀ ❉❄❅❇ ò❂❉❁❥❑◆◗✿❁❂❮❳ ❂ ❉❮❩ò ❭✭❴➇➈➉✇①⑥⑤⑤➋➍➎ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤Õ➻⑨⑩❰❷❸❹❺❻❾❿➪❿➪➁❿➪➂❿ó➅ó➁❿ó➅➂❳s ❉❄❅❇ ò❂❉❁❥❑◆◗✿❁❂❮❳ ❂ ❉❮❩ò ➦⑧④➋➍➎➊❭❫❴û➉✇➊➧④⑤➋➍➎ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤Õ➻⑨⑩õ❸❹❺❻❾❿ó➅❿ó➅➁❿ó➅➂❳s ❁ ❋❥❑◆◗Ô❋❳ ❂ ❉✺❩❮ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤⑧⑧➏➜➝➞➜➟➠➡➢➤➥➠⑧⑤③➦➠⑤➧➻õ⑨➾➚❹❺❻ùë õ❷➾÷❷⑨➾➚❹❺❻ùë❿ó➅❿ó➅➁❿ó➅➂❳➱ ❋❄❅❇ ❋❳ ❂ ❋❁❩❃ ❇✒❫❴û➉✦❜✓✔ß✇à⑧⑤✪ ➜➝➞➜➟➠➡➢➤➥➠⑧⑤③④➠⑤③④➾⑩õ÷⑨⑩➾❸❹❺❻ùë✽➫âýâ➳➫Ýâ➳➯➁❿ú➂ú❿➃➄➅ ❁ ❋ú ❨❑◗ ❋❁❩❃ ❭❫❴➇➈➉✇➊⑧⑤⑤➋➍➎ ③④⑤③⑦⑤③➼⑧④❷⑨➾➚❹❺❻❝ ▼❛sss❝❛❧❡❬❚❡✖❪✶✙✚✛ ✶ ✢✣✥✼✧✽★✩✫ ✢✣✥✬✯★✩✫❆✰✲❆✳ ✳❯✳❨ ✳✴❛r✹✻✴✿❁ ❃ ❄❅❈ ❍✲ ✲■❏✴r ✲✐♠✐❑✿◆❖◗❖❩❭❫ ❴❩❣❩❭❖❢❥❧q ✈②③✈④ ⑤⑥⑦⑧⑨⑩⑨❶❷⑥❸❹❺❻❼❽❾❽✶❿➀⑦➁➂❖➃➄➅➆➇✺➄✺➈✷➉➊➃➊➋✷✹✺➆➌➆➉➄➆➍➄✺➎➆➇➇➄➉➎➉✷➇➊➃➃✺➏➇✷➆✷✺➇➊✻➐✹✺➃➊➎✺➃➆➉➇➇✹➊➏➃➑
Figure 5: Mass reach of ATLAS searches for Supersymmetry [18]. Only a represen-tative selection of the available results is shown. Blue (green) bands indicate 13 TeV(8 TeV) data results.
Model ℓ , γ Jets † E missT R L dt[fb − ] Limit Reference E x t r ad i m en s i on s G augebo s on s C I D M L Q H ea vy qua r ks E xc i t ed f e r m i on s O t he r ADD G KK + g / q − ≥ j Yes 3.2 n =2 M D ADDnon-resonant ℓℓ e , µ − − n =3 HLZ 1407.2410 M S ADDQBH → ℓ q e , µ − n =6 M th ADDQBH − − n =6 ATLAS-CONF-2016-069 M th ADDBHhigh P p T ≥ e , µ ≥ j − n =6 , M D =3 TeV,rotBH 1606.02265 M th ADDBHmultijet − ≥ j − n =6 , M D =3 TeV,rotBH 1512.02586 M th RS1 G KK → ℓℓ e , µ − − k / M Pl =0.1 G KK mass RS1 G KK → γγ γ − − k / M Pl =0.1 G KK mass BulkRS G KK → WW → qq ℓν e , µ
1J Yes 13.2 k / M Pl =1.0 ATLAS-CONF-2016-062 G KK mass BulkRS G KK → HH → bbbb − − k / M Pl =1.0 ATLAS-CONF-2016-049 G KK mass BulkRS g KK → tt e , µ ≥ b, ≥ J/2j Yes 20.3
BR=0.925 1505.07018 g KK mass e , µ ≥ b, ≥ j Yes 3.2 Tier(1,1),BR( A (1,1) → tt )=1 ATLAS-CONF-2016-013 KKmass
SSM Z ′ → ℓℓ e , µ − − ATLAS-CONF-2016-045 Z ′ mass SSM Z ′ → ττ τ − − Z ′ mass Leptophobic Z ′ → bb − − Z ′ mass SSM W ′ → ℓν e , µ − Yes 13.3
ATLAS-CONF-2016-061 W ′ mass HVT W ′ → WZ → qq νν modelA 0 e , µ
1J Yes 13.2 g V =1 ATLAS-CONF-2016-082 W ′ mass HVT W ′ → WZ → qqqq modelB − − g V =3 ATLAS-CONF-2016-055 W ′ mass HVT V ′ → WH / ZH modelB multi-channel 3.2 g V =3 V ′ mass LRSM W ′ R → tb e , µ W ′ mass LRSM W ′ R → tb e , µ ≥ b,1J − W ′ mass CI qqqq − − η LL = − ATLAS-CONF-2016-069 Λ CI ℓℓ qq e , µ − − η LL = − Λ CI uutt ≥ e , µ ≥ ≥
1j Yes 20.3 | C RR | =1 Λ Axial-vectormediator(DiracDM) 0 e , µ ≥ j Yes 3.2 g q =0.25, g χ =1.0, m ( χ ) < GeV 1604.07773 m A Axial-vectormediator(DiracDM) 0 e , µ ,1 γ j Yes 3.2 g q =0.25, g χ =1.0, m ( χ ) < GeV 1604.01306 m A ZZ χχ EFT(DiracDM) 0 e , µ ≤ j Yes 3.2 m ( χ ) < GeV ATLAS-CONF-2015-080 M ∗ ScalarLQ1 st gen 2 e ≥ j − β =1 LQmass
ScalarLQ2 nd gen 2 µ ≥ j − β =1 LQmass
ScalarLQ3 rd gen 1 e , µ ≥ ≥
3j Yes 20.3 β =0 LQmass
VLQ TT → Ht + X e , µ ≥ b, ≥ j Yes 20.3 Tin(T,B)doublet 1505.04306 T mass VLQ YY → Wb + X e , µ ≥ b, ≥ j Yes 20.3 Yin(B,Y)doublet 1505.04306 Y mass VLQ BB → Hb + X e , µ ≥ b, ≥ j Yes 20.3 isospinsinglet 1505.04306 B mass VLQ BB → Zb + X ≥ e , µ ≥ ≥ − Bin(B,Y)doublet 1409.5500 B mass VLQ QQ → WqWq e , µ ≥ j Yes 20.3 Q mass VLQ T / T / → WtWt ≥ e , µ ≥ ≥
1j Yes 3.2
ATLAS-CONF-2016-032 T / mass Excitedquark q ∗ → q γ γ − only u ∗ and d ∗ , Λ= m ( q ∗ ) q ∗ mass Excitedquark q ∗ → qg − − only u ∗ and d ∗ , Λ= m ( q ∗ ) ATLAS-CONF-2016-069 q ∗ mass Excitedquark b ∗ → bg − − ATLAS-CONF-2016-060 b ∗ mass Excitedquark b ∗ → Wt e , µ f g = f L = f R =1 b ∗ mass Excitedlepton ℓ ∗ e , µ − − Λ=3.0
TeV 1411.2921 ℓ ∗ mass Excitedlepton ν ∗ e , µ , τ − − Λ=1.6
TeV 1411.2921 ν ∗ mass LSTC a T → W γ e , µ ,1 γ − Yes 20.3 a T mass LRSMMajorana ν e , µ − m ( W R )=2.4 TeV,nomixing 1506.06020 N mass Higgstriplet H ±± → ee e (SS) − − DYproduction,BR( H ±± L → ee )=1 ATLAS-CONF-2016-051 H ±± mass Higgstriplet H ±± → ℓτ e , µ , τ − − DYproduction,BR( H ±± L → ℓτ ) =1 1411.2921 H ±± mass Monotop(non-resprod) 1 e , µ
1b Yes 20.3 a non − res =0.2 spin-1invisibleparticlemass Multi-chargedparticles − − −
DYproduction, | q | =5 e multi-chargedparticlemass Magneticmonopoles − − −
DYproduction, | g | =1 g D ,spin / monopolemass Massscale[TeV] − √ s =8TeV √ s =13TeV ATLAS Exotics Searches* - 95% CL Exclusion
Status:August2016
ATLAS
Preliminary R L dt =(3.2-20.3)fb − √ s =8,13TeV *Onlyaselectionoftheavailablemasslimitsonnewstatesorphenomenaisshown.Lowerboundsarespecifiedonlywhenexplicitlynotexcluded. † Small-radius(large-radius)jetsaredenotedbytheletterj(J).
Figure 6: Reach of ATLAS searches for new phenomena other than Supersymme-try [19]. Only a representative selection of the available results is shown. Yellow(green) bands indicate 13 TeV (8 TeV) data results.
After the first LHC long shutdown ATLAS has enhanced detectors and trigger sys-tems that are coping very well with a pile-up environment beyond the design. Manymeasurements of Standard Model processes have been made, accessing simple andcomplex final states, probing perturbative QCD, searching for fermionic Higgs cou-7lings and starting precise measurements of its properties at 13 TeV. The largercentre-of-mass energy has allowed a major extension of reach compared to Run 1 andmany topologies for BSM physics have been explored. In general the data agree wellwith the background expectations, therefore a significant increase in excluded BSMparticle mass ranges has been set. Some modest excesses are observed: the rest of2016 data will show if they persist or go away.
References [1] ATLAS Collaboration, JINST (2008) S08003.[2] https://twiki.cern.ch/twiki/bin/view/AtlasPublic/TriggerOperationPublicResults.[3] https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CombinedSummaryPlots/SM/.[4] ATLAS Collaboration, ATLAS-CONF-2016-046.[5] ATLAS Collaboration, arXiv:1606:04017.[6] ATLAS Collaboration, Phys. Lett. B716 (2012) 1[7] CMS Collaboration, Phys. Lett.
B716 (2012) 30.[8] ATLAS and CMS Collaborations, Phys. Rev. Lett. (2015) 191803;arXiv:1503.07589.[9] ATLAS and CMS Collaborations, JHEP (2016) 045; arXiv:1606.02266.[10] ATLAS Collaboration, ATLAS-CONF-2016-081.[11] ATLAS Collaboration, ATLAS-CONF-2016-091.[12] ATLAS Collaboration, ATLAS-CONF-2016-055.[13] ATLAS Collaboration, JHEP09