Search
Results
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Study of the Dijet Mass Spectrum in pp→W+jets Events at √s=7 TeV
(2012)Physical Review LettersWe report an investigation of the invariant mass spectrum of the two jets with highest transverse momentum in pp→W+2-jet and W+3-jet events to look for resonant enhancement. The data sample corresponds to an integrated luminosity of 5.0 fb−1 collected with the CMS detector at √s=7 TeV. We find no evidence for the anomalous structure reported by the CDF Collaboration, and establish an upper limit of 5.0 pb at 95% confidence level on the ...Journal Article -
Search for three-jet resonances in pp collisions at √s=7 TeV
(2012)Physics Letters BResults are reported from a search for the production of three-jet resonances in pp collisions at a center-of-mass energy √s=7 TeV. The study uses the data sample collected by the CMS experiment at the LHC in 2011, corresponding to an integrated luminosity of 5.0fb-1. Events with high jet multiplicity and a large scalar sum of jet transverse momenta are analyzed for the presence of resonances in the three-jet invariant mass spectrum. No ...Journal Article -
Measurement of the relative prompt production rate of χ c2 and χ c1 in pp collisions at √s=7 TeV
(2012)The European Physical Journal CA measurement is presented of the relative prompt production rate of χ c2 and χ c1 with 4.6 fb−1 of data collected by the CMS experiment at the LHC in pp collisions at s√=7 TeV. The two states are measured via their radiative decays χ c→J/ψ+γ, with the photon converting into an e+e− pair for J/ψ rapidity |y(J/ψ)|<1.0 and photon transverse momentum p T(γ)>0.5 GeV/c. The measurement is given for six intervals of p T(J/ψ) between 7 and 25 ...Journal Article -
Search for heavy lepton partners of neutrinos in proton–proton collisions in the context of the type III seesaw mechanism
(2012)Physics Letters BA search is presented in proton-proton collisions at s=7TeV for fermionic triplet states expected in type III seesaw models. The search is performed using final states with three isolated charged leptons and an imbalance in transverse momentum. The data, collected with the CMS detector at the LHC, correspond to an integrated luminosity of 4.9fb -1. No excess of events is observed above the background predicted by the standard model, and ...Journal Article -
Search for pair produced fourth-generation up-type quarks in pp collisions at √s=7 TeV with a lepton in the final state
(2012)Physics Letters BThe results of a search for the pair production of a fourth-generation up-type quark (t') in proton-proton collisions at √s=7 TeV are presented, using data corresponding to an integrated luminosity of about 5.0 fb -1 collected by the Compact Muon Solenoid experiment at the LHC. The t' quark is assumed to decay exclusively to a W boson and a b quark. Events with a single isolated electron or muon, missing transverse momentum, and at least ...Journal Article -
Combined search for the quarks of a sequential fourth generation
(2012)Physical Review DResults are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5 fb−1 recorded by the CMS experiment at the LHC in 2011. A novel strategy has been developed for a combined search for quarks of the up and down type in decay channels with at least one isolated muon or electron. Limits on the mass of the fourth-generation quarks and the relevant ...Journal Article -
Measurement of the top-quark mass in tt − events with lepton+jets final states in pp collisions at √s =7 TeV
(2012)Journal of High Energy PhysicsThe mass of the top quark is measured using a sample of tt¯ candidate events with one electron or muon and at least four jets in the final state, collected by CMS in pp collisions at s√=7 TeV at the LHC. A total of 5174 candidate events is selected from data corresponding to an integrated luminosity of 5.0 fb−1. For each event the mass is reconstructed from a kinematic fit of the decay products to a tt¯ hypothesis. The top-quark mass is ...Journal Article -
Search for resonant t(t)over-bar production in lepton plus jets events in pp collisions at s √ =7 TeV
(2012)Journal of High Energy PhysicsA 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 ...Journal Article -
Measurement of the single-top-quark t-channel cross section in pp collisions at root s=7 TeV
(2012)Journal of High Energy PhysicsA measurement of the single-top-quark t-channel production cross section in pp collisions at s√=7 TeV with the CMS detector at the LHC is presented. Two different and complementary approaches have been followed. The first approach exploits the distributions of the pseudorapidity of the recoil jet and reconstructed top-quark mass using background estimates determined from control samples in data. The second approach is based on multivariate ...Journal Article -
Observation of Z decays to four leptons with the CMS detector at the LHC
(2012)Journal of High Energy PhysicsThe first observation of the Z boson decaying to four leptons in proton-proton collisions is presented. The analyzed data set corresponds to an integrated luminosity of 5.02 fb−1 at s√=7 TeV collected by the CMS detector at the Large Hadron Collider. A pronounced resonance peak, with a statistical significance of 9.7 σ, is observed in the distribution of the invariant mass of four leptons (electrons and/or muons) with mass and width ...Journal Article