M. Marone

Measurement of differential top-quark pair production cross sections in pp collisions at sqrt(s) = 7 TeV

Normalised differential top-quark-pair production cross sections are measured in pp collisions at a centre-of-mass energy of 7 TeV at the LHC with the CMS detector using data recorded in 2011 corresponding to an integrated luminosity of 5.0 fb−1. The measurements are performed in the lepton+jets decay channels (e+jets and μ+jets) and the dilepton decay channels (e+e−, μ+μ−, and μ±e∓). The tt differential cross section is measured as a function of kinematic properties of the final-state charged leptons and jets associated to b quarks, as well as those of the top quarks and the tt system. The data are compared with several predictions from perturbative QCD calculations up to approximate next-to-next-to-leading-order precision. No significant deviations from the standard model are observed. Submitted to the European Physical Journal C c

Measurement of the ratio B(B0s -> J/psi f0(980))/B(B0s -> J/psi phi(1020)) in pp collisions at sqrt(s) = 7 TeV

The ratio Rf0/φ of the branching fractions of the B 0 s meson to the CP-odd eigenstate J/ψ f0(980) and to J/ψ φ(1020) is measured, where J/ψ → μ+μ−, f0 → π+π−, and φ→ K+K−. The analysis is based on a data sample of pp collisions at a centre-of-mass energy of 7 TeV, collected by the CMS experiment, corresponding to an integrated luminosity of 5.3 fb−1. The result is Rf0/φ = 0.140 ± 0.013 ± 0.018, where the first uncertainty is statistical and the second is systematic. This result is consistent with theoretical predictions and previous measurements of Rf0/φ. It is the most precise measurement of the ratio to date. Submitted to Physics Letters B c

Measurements of the Y(1S), Y(2S), and Y(3S) differential cross sections in pp collisions at sqrt(s) = 7 TeV

Differential cross sections as a function of transverse momentum pT are presented for the production of Υ(nS) (n = 1, 2, 3) states decaying into a pair of muons. Data corresponding to an integrated luminosity of 4.9 fb−1 in pp collisions at √ s = 7 TeV were collected with the CMS detector at the LHC. The analysis selects events with dimuon rapidity |y| < 1.2 and dimuon transverse momentum in the range 10 < pT < 100 GeV. The measurements show a transition from an exponential to a powerlaw behavior at pT ≈ 20 GeV for the three Υ states. Above that transition, the Υ(3S) spectrum is significantly harder than that of the Υ(1S) and Υ(2S). The ratios of the Υ(3S) and Υ(2S) differential cross sections to the Υ(1S) cross section show a rise as pT increases at low pT, then become flatter at higher pT. Submitted to Physics Letters B c

Jet production in association with vector bosons at CMS

The associated production of jets and vector bosons allows for stringent tests of perturbative QCD calculations and is sensitive to the possible presence of new physics beyond the Standard Model. Measurements of jet production rates in association with W, Z or photons, in protonproton collisions at a 7 TeV center-of-mass energy are presented, using data collected with the CMS detector. In particular, we compare data to the theory predictions on jet rates, dijet invariant mass, angular correlations and event shapes distributions.

Search for supersymmetry in hadronic final states with missing transverse energy using the variables alphaT and b-quark multiplicity in pp collisions at sqrt(s) = 8 TeV

An inclusive search for supersymmetric processes that produce final states with jets and missing transverse energy is performed in pp collisions at a centre-of-mass energy of 8 TeV. The data sample corresponds to an integrated luminosity of 11.7 fb−1 collected by the CMS experiment at the LHC. In this search, a dimensionless kinematic variable, αT, is used to discriminate between events with genuine and misreconstructed missing transverse energy. The search is based on an examination of the number of reconstructed jets per event, the scalar sum of transverse energies of these jets, and the number of these jets identified as originating from bottom quarks. No significant excess of events over the standard model expectation is found. Exclusion limits are set in the parameter space of simplified models, with a special emphasis on both compressed-spectrum scenarios and direct or gluino-induced production of third-generation squarks. For the case of gluino-mediated squark production, gluino masses up to 950–1125 GeV are excluded depending on the assumed model. For the direct pair-production of squarks, masses up to 450 GeV are excluded for a single light first- or second-generation squark, increasing to 600 GeV for bottom squarks.

Measurement of Inelastic, Diffractive and Exclusive Processes in pp Collisions with CMS

A measurement of the total, inelastic pp cross section at 7 TeV, based on the observation of pile-up events, is presented. Measurements of soft and hard diffractive processes obtained with the CMS detector at various centre-of-mass energies are presented and compared with the PYTHIA6, PHOJET and PYTHIA8 Monte Carlo generators. The ratio of diffractive to inclusive jet production is obtained and the rapidity gap survival probability is estimated from the comparison of data to predictions of the POMPYT generator. A measurement of exclusive production of muon pairs in pp collisions at √ s = 7 TeV is also presented. Single differential cross sections are obtained as function of the dimuon transverse momentum, invariant mass and acoplanarity for dimuon pairs with an invariant mass above 11 GeV. Data are compared to predictions of the LPAIR Monte Carlo model.

Search for B0s to mu+ mu- and B0 to mu+ mu- decays

A search for the rare decays Bs → μ+μ− and B0 → μ+μ− is performed in pp collisions at √ s = 7 TeV, with a data sample corresponding to an integrated luminosity of 5 fb−1 collected by the CMS experiment at the LHC. In both decays, the number of events observed after all selection requirements is consistent with the expectation from background plus standard model signal predictions. The resulting upper limits on the branching fractions areB(Bs → μ+μ−) < 7.7× 10−9 andB(B0 → μ+μ−) < 1.8× 10−9 at 95% confidence level. Submitted to the Journal of High Energy Physics ∗See Appendix A for the list of collaboration members ar X iv :1 20 3. 39 76 v2 [ he pex ] 2 3 Ja n 20 13A bstractA search for the rare decays

ECAL front-end monitoring in the CMS experiment

{\text{B}}_{\text{s}}^0

The CMS ECAL database services for detector control and monitoring

→ μ+μ− and B0 → μ+μ− is performed in pp collisions at

Search for massive WH resonances decaying into the l nu b b-bar final state at sqrt(s) = 8 TeV

\sqrt {s} = {7}\;{\text{TeV}}