Search
Results
-
Search for the standard model Higgs boson produced in association with W and Z bosons in pp collisions at √s=7 TeV
(2012)Journal of High Energy PhysicsA search for the Higgs boson produced in association with a W or Z boson in proton-proton collisions at a center-of-mass energy of 7 TeV is performed with the CMS detector at the LHC using the full 2011 data sample, from an integrated luminosity of 5 fb−1. Higgs boson decay modes to ττ and WW are explored by selecting events with three or four leptons in the final state. No excess above background expectations is observed, resulting in ...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 -
Search for a light charged Higgs boson in top quark decays in pp collisions at √s=7TeV
(2012)Journal of High Energy PhysicsResults are presented on a search for a light charged Higgs boson that can be produced in the decay of the top quark t → H+b and which, in turn, decays into τ +ν τ . The analysed data correspond to an integrated luminosity of about 2 fb−1 recorded in protonproton collisions at s√=7TeV by the CMS experiment at the LHC. The search is sensitive to the decays of the top quark pairs tt¯ → H± W ∓ bb¯¯¯ and tt¯ → H±H∓ bb¯¯¯. Various final states ...Journal Article -
Search for third-generation leptoquarks and scalar bottom quarks in pp collisions at √s=7TeV
(2012)Journal of High Energy PhysicsResults are presented from a search for third-generation leptoquarks and scalar bottom quarks in a sample of proton-proton collisions at s√=7TeV 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 observed events is found to be in agreement with the ...Journal Article -
Search for dark matter and large extra dimensions in monojet events in pp collisions at √s= 7 TeV
(2012)Journal of High Energy PhysicsA 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. ...Journal Article -
Search for B0stoμ+μ− and B0toμ+μ− decays
(2012)Journal of High Energy PhysicsA search for the rare decays B0s → μ + μ − and B0 → μ + μ − is performed in pp collisions at s√=7TeV, 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 ...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 -
Search for supersymmetry in hadronic final states using MT2 in pp collisions at √s=7 TeV.
(2012)Journal of High Energy PhysicsA search for supersymmetry or other new physics resulting in similar final states is presented using a data sample of 4.73 fb−1 of pp collisions collected at s√=7 TeV with the CMS detector at the LHC. Fully hadronic final states are selected based on the variable M T2, an extension of the transverse mass in events with two invisible particles. Two complementary studies are performed. The first targets the region of parameter space with ...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 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