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Articles 61 - 88 of 88
Full-Text Articles in Physics
Measurement Of The Inclusive Production Cross Sections For Forward Jets And For Dijet Events With One Forward And One Central Jet In Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, The Cms Collaboration
Measurement Of The Inclusive Production Cross Sections For Forward Jets And For Dijet Events With One Forward And One Central Jet In Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
The inclusive production cross sections for forward jets, as well for jets in dijet events with at least one jet emitted at central and the other at forward pseudorapidities, are measured in the range of transverse momenta pT = 35-150 GeV/c in proton-proton collisions at √s =7 TeV by the CMS experiment at the LHC. Forward jets are measured within pseudorapidities 3.2 < |η| < 4.7, and central jets within the |η| < 2.8 range. The differential cross sections d2σ/dpT dη are compared to predictions from three approaches in perturbative quantum chromodynamics: (i) next-to-leading-order calculations obtained with and without matching to parton-shower Monte Carlo simulations, (ii) pythia and herwig parton-shower event generators with different tunes of parameters, and (iii) cascade and hej models, including different non-collinear corrections to standard single-parton radiation. The single-jet inclusive forward jet spectrum is well described by all models, but not all predictions are consistent with the spectra observed for the forward-central dijet events.
Search For Quark Compositeness In Dijet Angular Distributions From Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, The Cms Collaboration
Search For Quark Compositeness In Dijet Angular Distributions From Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A search for quark compositeness using dijet angular distributions from pp collisions at √s = 7 TeV is presented. The search has been carried out using a data sample corresponding to an integrated luminosity of 2.2 fb−1, recorded by the CMS experiment at the LHC. Normalized dijet angular distributions have been measured for dijet invariant masses from 0.4 TeV to above 3 TeV and compared with a variety of contact interaction models, including those which take into account the effects of next-to-leading-order QCD corrections. The data are found to be in agreement with the predictions of perturbative QCD, and lower …
Search For Resonant T̄T Production In Lepton+Jets Events In Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, The Cms Collaboration
Search For Resonant T̄T Production In Lepton+Jets Events In Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A model-independent search for the production of heavy resonances decaying into top-antitop quark pairs is presented. The search is based on events containing one lepton (muon or electron) and at least two jets selected from data samples corresponding to an integrated luminosity of 4.4-5.0 fb−1 collected in pp collisions at √s = 7 TeV. Results are presented from the combination of two dedicated searches optimized for boosted production and production at threshold. No excess of events is observed over the expected yield from the standard model processes. Topcolor Z′ bosons with narrow (wide) width are excluded at 95% confidence level …
Jet Production Rates In Association With W And Z Bosons In Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, The Cms Collaboration
Jet Production Rates In Association With W And Z Bosons In Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
Measurements of jet production rates in association with W and Z bosons for jet transverse momenta above 30 GeV are reported, using a sample of proton-proton collision events recorded by CMS at √s = 7TeV , corresponding to an integrated luminosity of 36 pb − 1. The study includes the measurement of the normalized inclusive rates of jets σ(V + ≥ n jets)/σ(V), where V represents either a W or a Z. In addition, the ratio of W to Z cross sections and the W charge asymmetry as a function of the number of associated jets are measured. A test …
Inclusive B-Jet Production In Pp Collisions At S√=7tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand
Inclusive B-Jet Production In Pp Collisions At S√=7tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand
Aerospace, Physics, and Space Science Faculty Publications
The inclusive b-jet production cross section in pp collisions at a center-of mass energy of 7 TeV is measured using data collected by the CMS experiment at the LHC. The cross section is presented as a function of the jet transverse momentum in the range 18 < p T < 200 GeV for several rapidity intervals. The results are also given as the ratio of the b-jet production cross section to the inclusive jet production cross section. The measurement is performed with two different analyses, which differ in their trigger selection and b-jet identification: a jet analysis that selects events with a b …
Search For The Standard Model Higgs Boson In The H → Zz → ℓ+ℓ−Τ+Τ− Decay Channel In Pp Collisions At S√=7tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov
Search For The Standard Model Higgs Boson In The H → Zz → ℓ+ℓ−Τ+Τ− Decay Channel In Pp Collisions At S√=7tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov
Aerospace, Physics, and Space Science Faculty Publications
A search is reported for the standard model Higgs boson in the H → ZZ → ℓ+ℓ−τ +τ − decay mode, where ℓ = μ or e, in proton-proton collisions at s=7TeV" role="presentation" style="box-sizing: inherit; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; text-wrap: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">s√=7TeV�=7TeV, corresponding to an integrated luminosity of 4.7 fb−1 collected with the CMS detector at the LHC. No evidence is found for a significant deviation from the background expectation. …
Search For Third-Generation Leptoquarks And Scalar Bottom Quarks In Pp Collisions At P S = 7 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, Francisco X. Yumiceva
Search For Third-Generation Leptoquarks And Scalar Bottom Quarks In Pp Collisions At P S = 7 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, Francisco X. Yumiceva
Aerospace, Physics, and Space Science Faculty Publications
Results are presented from a search for third-generation leptoquarks and scalar bottom quarks in a sample of proton-proton collisions at s=7TeV" role="presentation" style="box-sizing: inherit; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; text-wrap: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">s√=7TeV�=7��� collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 4.7 fb−1. A scenario where the new particles are pair produced and each decays to a b quark plus a tau neutrino or neutralino is considered. The number of …
Measurement Of Jet Fragmentation Into Charged Particles In Pp And Pbpb Collisions At √Snn=2.76 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov
Measurement Of Jet Fragmentation Into Charged Particles In Pp And Pbpb Collisions At √Snn=2.76 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov
Aerospace, Physics, and Space Science Faculty Publications
Jet fragmentation in pp and PbPb collisions at a centre-of-mass energy of 2.76 TeV per nucleon pair was studied using data collected with the CMS detector at the LHC. Fragmentation functions are constructed using charged-particle tracks with transverse momenta p T > 4 GeV/c for dijet events with a leading jet of p T > 100 GeV/c. The fragmentation functions in PbPb events are compared to those in pp data as a function of collision centrality, as well as dijet-p T imbalance. Special emphasis is placed on the most central PbPb events including dijets with unbalanced momentum, indicative …
Suppression Of Non-Prompt J/Ψ, Prompt J/Ψ, And Υ (1s) In Pbpb Collisions At Snn−−−√=2.76 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov
Suppression Of Non-Prompt J/Ψ, Prompt J/Ψ, And Υ (1s) In Pbpb Collisions At Snn−−−√=2.76 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov
Aerospace, Physics, and Space Science Faculty Publications
Yields of prompt and non-prompt J/ψ, as well as Υ" role="presentation" style="box-sizing: inherit; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; text-wrap: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">ΥΥ(1S) mesons, are measured by the CMS experiment via their μ + μ − decays in PbPb and pp collisions at sNN=2.76" role="presentation" style="box-sizing: inherit; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; text-wrap: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;" …
Search For B0s → Μ + Μ − And B0 → Μ + Μ − Decays, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor B. Vodopiyanov
Search For B0s → Μ + Μ − And B0 → Μ + Μ − Decays, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor B. Vodopiyanov
Aerospace, Physics, and Space Science Faculty Publications
A search for the rare decays B0s → 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 are B(B0s→μ+μ−)<7.7×10−9 and B(B0→μ+μ−)<1.8×10−9 at 95% confidence level.
Search For Leptonic Decays Of W′ Bosons In Pp Collisions At S√=7 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov
Search For Leptonic Decays Of W′ Bosons In Pp Collisions At S√=7 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov
Aerospace, Physics, and Space Science Faculty Publications
A search for a new heavy gauge boson W′ decaying to an electron or muon, plus a low mass neutrino, is presented. This study uses data corresponding to an integrated luminosity of 5.0 fb−1, collected using the CMS detector in pp collisions at a centre-of-mass energy of 7 TeV at the LHC. Events containing a single electron or muon and missing transverse momentum are analyzed. No significant excess of events above the standard model expectation is found in the transverse mass distribution of the lepton-neutrino system, and upper limits for cross sections above different transverse mass thresholds …
Exclusive Γγ → Μ + Μ − Production In Proton-Proton Collisions At S√=7 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov
Exclusive Γγ → Μ + Μ − Production In Proton-Proton Collisions At S√=7 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov
Aerospace, Physics, and Space Science Faculty Publications
A measurement of the exclusive two-photon production of muon pairs in proton-proton collisions at s=7" role="presentation" style="box-sizing: inherit; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; text-wrap: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">s√=7�=7 TeV, pp → pμ + μ −p, is reported using data corresponding to an integrated luminosity of 40 pb−1. For muon pairs with invariant mass greater than 11.5 GeV, transverse momentum p T (μ) > 4 GeV and pseudorapidity |η(μ)| …
Search For New Physics In Events With Same-Sign Dileptons And B-Tagged Jets In Pp Collisions At S√=7 Tev, The Cms Collaboration, S. Chatrchyan, Vardan Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor B. Vodopiyanov
Search For New Physics In Events With Same-Sign Dileptons And B-Tagged Jets In Pp Collisions At S√=7 Tev, The Cms Collaboration, S. Chatrchyan, Vardan Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor B. Vodopiyanov
Aerospace, Physics, and Space Science Faculty Publications
A search for new physics is performed using isolated same-sign dileptons with at least two b-quark jets in the final state. Results are based on a 4.98 fb−1 sample of proton-proton collisions at a centre-of-mass energy of 7 TeV collected by the CMS detector. No excess above the standard model background is observed. Upper limits at 95% confidence level are set on the number of events from non-standard-model sources. These limits are used to set constraints on a number of new physics models. Information on acceptance and efficiencies are also provided so that the results can be used to …
Search For Dark Matter And Large Extra Dimensions In Monojet Events In Pp Collisions At S√=7 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov
Search For Dark Matter And Large Extra Dimensions In Monojet Events In Pp Collisions At S√=7 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov
Aerospace, Physics, and Space Science Faculty Publications
A search has been made for events containing an energetic jet and an imbalance in transverse momentum using a data sample of pp collisions at a center-of-mass energy of 7 TeV. This signature is common to both dark matter and extra dimensions models. The data were collected by the CMS detector at the LHC and correspond to an integrated luminosity of 5.0 fb−1. The number of observed events is consistent with the standard model expectation. Constraints on the dark matter-nucleon scattering cross sections are determined for both spin-independent and spin-dependent interaction models. For the spin-independent model, these are …
Search For Stopped Long-Lived Particles Produced In Pp Collisions At S√=7tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor B. Vodopiyanov
Search For Stopped Long-Lived Particles Produced In Pp Collisions At S√=7tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor B. Vodopiyanov
Aerospace, Physics, and Space Science Faculty Publications
A search has been performed for long-lived particles that have stopped in the CMS detector, during 7 TeV proton-proton operations of the CERN LHC. The existence of such particles could be inferred from observation of their decays when there were no proton-proton collisions in the CMS detector, namely during gaps between LHC beam crossings. Using a data set in which CMS recorded an integrated luminosity of 4.0 fb−1, and a search interval corresponding to 246 hours of trigger live time, 12 events are observed, with a mean background prediction of 8.6 ± 2.4 events. Limits are presented at …
Charged Particle Multiplicities In Pp Interactions At √S = 0.9, 2.36, And 7 Tev, V. Khachatryan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Charged Particle Multiplicities In Pp Interactions At √S = 0.9, 2.36, And 7 Tev, V. Khachatryan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
Measurements of primary charged hadron multiplicity distributions are presented for non-single-diffractive events in proton-proton collisions at centre-of-mass energies of √s = 0.9, 2.36, and 7 TeV, in five pseudorapidity ranges from |η| < 0.5 to |η| < 2.4. The data were collected with the minimum-bias trigger of the CMS experiment during the LHC commissioning runs in 2009 and the 7 TeV run in 2010. The multiplicity distribution at √s = 0.9 TeV is in agreement with previous measurements. At higher energies the increase of the mean multiplicity with √s is underestimated by most event generators. The average transverse momentum as a function of the multiplicity is also presented. The measurement of higher-order moments of the multiplicity distribution confirms the violation of Koba-Nielsen-Olesen scaling that has been observed at lower energies.
Charged Particle Transverse Momentum Spectra In Pp Collisions At √S = 0:9 And 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Charged Particle Transverse Momentum Spectra In Pp Collisions At √S = 0:9 And 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
The charged particle transverse momentum (pT) spectra are presented for pp collisions at √s = 0.9 and 7 TeV. The data samples were collected with the CMS detector at the LHC and correspond to integrated luminosities of 231 μb−1 and 2.96 pb−1, respectively. Calorimeter-based high-transverse-energy triggers are employed to enhance the statistical reach of the high-pT measurements. The results are compared with leading and next-to-leading order QCD and with an empirical scaling of measurements at different collision energies using the scaling variable xT ≡ 2pT / √s over the pT range up to 200 GeV / c. Using a combination …
Long-Range And Short-Range Dihadron Angular Correlations In Central Pbpb Collisions At Psnn = 2:76 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert Ralich, Igor Vodopiyanov, The Cms Collaboration
Long-Range And Short-Range Dihadron Angular Correlations In Central Pbpb Collisions At Psnn = 2:76 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert Ralich, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
First measurements of dihadron correlations for charged particles are presented for central PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV over a broad range in relative pseudorapidity (∆η) and the full range of relative azimuthal angle (∆η). The data were collected with the CMS detector, at the LHC. A broadening of the away-side (∆ϕ ≈ π) azimuthal correlation is observed at all ∆η, as compared to the measurements in pp collisions. Furthermore, long-range dihadron correlations in ∆η are observed for particles with similar ϕ values. This phenomenon, also known as the “ridge”, persists up to at least |∆η| …
Search For Resonances In The Dilepton Mass Distribution In Pp Collisions At √S = 7tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Search For Resonances In The Dilepton Mass Distribution In Pp Collisions At √S = 7tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A search for narrow resonances at high mass in the dimuon and dielectron channels has been performed by the CMS experiment at the CERN LHC, using pp collision data recorded at √s = 7 TeV. The event samples correspond to integrated luminosities of 40 pb−1 in the dimuon channel and 35 pb−1 in the dielectron channel. Heavy dilepton resonances are predicted in theoretical models with extra gauge bosons (Z′) or as Kaluza-Klein graviton excitations (GKK) in the Randall-Sundrum model. Upper limits on the inclusive cross section of Z′(GKK) → ℓ+ℓ− relative to Z → ℓ+ℓ− are presented. These limits exclude …
Search For Light Resonances Decaying Into Pairs Of Muons As A Signal Of New Physics, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Search For Light Resonances Decaying Into Pairs Of Muons As A Signal Of New Physics, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A search for groups of collimated muons is performed using a data sample collected by the CMS experiment at the LHC, at a centre-of-mass energy of 7 TeV, and corresponding to an integrated luminosity of 35 pb−1 . The analysis searches for production of new low-mass states decaying into pairs of muons and is designed to achieve high sensitivity to a broad range of models predicting leptonic jet signatures. With no excess observed over the background expectation, upper limits on the production cross section times branching fraction times acceptance are set, ranging from 0.1 to 0.5 pb at the 95% …
Measurements Of Inclusive W And Z Cross Sections In Pp Collisions At √S = 7 Tev, V. Khachatryan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Measurements Of Inclusive W And Z Cross Sections In Pp Collisions At √S = 7 Tev, V. Khachatryan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
Measurements of inclusive W and Z boson production cross sections in pp collisions at √s = 7 TeV are presented, based on 2.9 pb−1 of data recorded by the CMS detector at the LHC. The measurements, performed in the electron and muon decay channels, are combined to give σ(pp→WX) × B(W→ℓν) = 9.95 ± 0.07 (stat.) ± 0.28 (syst.) ±1.09 (lumi.) nb and σ(pp→ZX) × B(Z→ℓ+ℓ−) = 0.931 ± 0.026 stat.) ± 0.023 (syst.) ± 0.102 (lumi.) nb, where ℓ stands for either e or μ. Theoretical predictions, calculated at the next-to-next-to-leading order in QCD using recent parton distribution functions, …
Measurement Of The Drell-Yan Cross Section In Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, The Cms Collaboration
Measurement Of The Drell-Yan Cross Section In Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
The Drell-Yan differential cross section is measured in pp collisions at √s = 7 TeV, from a data sample collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 36 pb−1. The cross section measurement, normalized to the measured cross section in the Z region, is reported for both the dimuon and dielectron channels in the dilepton invariant mass range 15–600 GeV. The normalized cross section values are quoted both in the full phase space and within the detector acceptance. The effect of final state radiation is also identified. The results are found to agree with …
Measurement Of The Lepton Charge Asymmetry In Inclusive W Production In Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Measurement Of The Lepton Charge Asymmetry In Inclusive W Production In Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A measurement of the lepton charge asymmetry in inclusive pp → WX production at √s = 7 TeV is presented based on data recorded by the CMS detector at the LHC and corresponding to an integrated luminosity of 36 pb−1. This high precision measurement of the lepton charge asymmetry, performed in both the W → eν and W → μν channels, provides new insights into parton distribution functions.
Search For Supersymmetry In Pp Collisions At √S = 7 Tev In Events With A Single Lepton, Jets, And Missing Transverse, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Search For Supersymmetry In Pp Collisions At √S = 7 Tev In Events With A Single Lepton, Jets, And Missing Transverse, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
Results are reported from a search for physics beyond the standard model in proton-proton collisions at a center-of-mass energy of 7 TeV, focusing on the signature with a single, isolated, high-transverse-momentum lepton (electron or muon), energetic jets, and large missing transverse momentum. The data sample comprises an integrated luminosity of 36 pb−1, recorded by the CMS experiment at the LHC. The search is motivated by models of new physics, including supersymmetry. The observed event yields are consistent with standard model backgrounds predicted using control samples obtained from the data. The characteristics of the event sample are consistent with those expected …
Search For New Physics With Jets And Missing Transverse Momentum In Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Search For New Physics With Jets And Missing Transverse Momentum In Pp Collisions At √S = 7 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A search for new physics is presented based on an event signature of at least three jets accompanied by large missing transverse momentum, using a data sample corresponding to an integrated luminosity of 36 pb−1 collected in proton-proton collisions at √s = 7 TeV with the CMS detector at the LHC. No excess of events is observed above the expected standard model backgrounds, which are all estimated from the data. Exclusion limits are presented for the constrained minimal supersymmetric extension of the standard model. Cross section limits are also presented using simplified models with new particles decaying to an undetected …
Measurement Of The Underlying Event Activity At The Lhc With √S = 7 Tev And Comparison With √S = 0.9 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Measurement Of The Underlying Event Activity At The Lhc With √S = 7 Tev And Comparison With √S = 0.9 Tev, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A measurement of the underlying activity in events with a jet of transverse momentum in the several GeV region is performed in proton-proton collisions at √s = 0.9 and 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |η|<2 and transverse momentum pT >0.5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. A significant growth of the average multiplicity and scalar-pT sum of the particles in the transverse region is observed with increasing pT of the leading trackjet, followed by a much …
Measurement Of The Inclusive W And Z Production Cross Sections In Pp Collisions At √S = 7 Tev With The Cms Experiment, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, The Cms Collaboration
Measurement Of The Inclusive W And Z Production Cross Sections In Pp Collisions At √S = 7 Tev With The Cms Experiment, S. Chatrchyan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, Himali Kalakhety, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A measurement of inclusive W and Z production cross sections in pp collisions at √s = 7 TeV is presented. The electron and muon decay channels are analyzed in a data sample collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 36 pb−1. The measured inclusive cross sections are σ(pp → WX) × B(W→ℓν) = 10.31 ± 0.02 (stat.) ± 0.09 (syst.) ± 0.10 (th.) ± 0.41 (lumi.) nb and σ(pp → ZX) × B(Z→ℓ+ℓ−) = 0.974 ± 0.007 (stat.) ± 0.007 (syst.) ± 0.018 (th.) ± 0.039 (lumi.) nb, limited to the dilepton …
Observation Of Long-Range, Near-Side Angular Correlations In Proton-Proton Collisions At The Lhc, Vardan Khachatryan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, H. Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Observation Of Long-Range, Near-Side Angular Correlations In Proton-Proton Collisions At The Lhc, Vardan Khachatryan, Marc M. Baarmand, B. Dorney, Samir Guragain, Marcus Hohlmann, H. Kalakhety, Robert M. Ralich, Igor Vodopiyanov, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7TeV are presented, using data collected with the CMS detector over a broad range of pseudorapidity (η) and azimuthal angle (φ). Short-range correlations in Δη, which are studied in minimum bias events, are characterized using a simple "independent cluster" parametrization in order to quantify their strength (cluster size) and their extent in η (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 nb -1 data set at …