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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 -
Search for a W′ or Techni-ρ Decaying into WZ in pp Collisions at √s=7 TeV
(2012)Physical Review LettersA search is performed in pp collisions at √s=7 TeV for exotic particles decaying via WZ to final states with electrons and muons. The data sample corresponds to an integrated luminosity of approximately 5 fb−1. No significant excess is observed in the data above the expected standard model background. Upper bounds at 95% confidence level are set on the production cross section of the W′ boson described by the sequential standard model ...Journal Article -
Search for New Physics in the Multijet and Missing Transverse Momentum Final State in Proton-Proton Collisions at √s=7 TeV
(2012)Physical Review LettersA search for physics beyond the standard model is performed in events with at least three jets and large missing transverse momentum produced in proton-proton collisions at a center-of-mass energy of √s=7 TeV. No significant excess of events above the expected backgrounds is observed in 4.98 fb−1 of data collected with the CMS detector at the Large Hadron Collider. The results are presented in the context of the constrained minimal ...Journal Article -
Search for supersymmetry in events with b-quark jets and missing transverse energy in pp collisions at 7 TeV
(2012)Physical Review DResults are presented from a search for physics beyond the standard model based on events with large missing transverse energy, at least three jets, and at least one, two, or three b-quark jets. The study is performed using a sample of proton-proton collision data collected at √s=7 TeV with the CMS detector at the LHC in 2011. The integrated luminosity of the sample is 4.98 fb−1. The observed number of events is found to be consistent ...Journal Article -
Measurement of the Pseudorapidity and Centrality Dependence of the Transverse Energy Density in Pb-Pb Collisions at √sNN=2.76 TeV
(2012)Physical Review LettersThe transverse energy (ET) in Pb-Pb collisions at 2.76 TeV nucleon-nucleon center-of-mass energy (√sNN) has been measured over a broad range of pseudorapidity (η) and collision centrality by using the CMS detector at the LHC. The transverse energy density per unit pseudorapidity (dET/dη) increases faster with collision energy than the charged particle multiplicity. This implies that the mean energy per particle is increasing with collision ...Journal Article -
Search for nu(mu) -> nu(tau) oscillation with the OPERA experiment in the CNGS beam
(2012)New Journal of PhysicsThe OPERA neutrino experiment in the underground Gran Sasso Laboratory (LNGS) was designed to perform the first detection of neutrino oscillations in direct appearance mode in the νμ → ντ channel, the ντ signature being the identification of the τ-lepton created in its charged current interaction. The hybrid apparatus consists of a large mass emulsion film/lead target complemented by electronic detectors. Placed in the LNGS, it is exposed ...Journal Article -
Momentum measurement by the multiple Coulomb scattering method in the OPERA lead-emulsion target
(2012)New Journal of PhysicsA new method of momentum measurement of charged particles through multiple Coulomb scattering (MCS) in the OPERA lead-emulsion target is presented. It is based on precise measurements of track angular deviations carried out thanks to the very high resolution of nuclear emulsions. The algorithm has been tested with Monte Carlo pions. The results are found to describe within the expected uncertainties the data obtained from test beams. We ...Journal Article -
Search for the Standard Model Higgs Boson in the Decay Channel H→ZZ→4l in pp Collisions at √s=7 TeV
(2012)Physical Review LettersA search for a Higgs boson in the four-lepton decay channel H→ZZ, with each Z boson decaying to an electron or muon pair, is reported. The search covers Higgs boson mass hypotheses in the range of 110<mH<600 GeV. The analysis uses data corresponding to an integrated luminosity of 4.7 fb−1 recorded by the CMS detector in pp collisions at √s=7 TeV from the LHC. Seventy-two events are observed with four-lepton invariant mass m4ℓ>100 GeV ...Journal Article -
Search for pair production of first- and second-generation scalar leptoquarks in pp collisions at √s=7 TeV
(2012)Physical Review DResults are presented from a search for the pair production of first- and second-generation scalar leptoquarks in proton-proton collisions at √s=7 TeV. The data sample corresponds to an integrated luminosity of 5.0 fb−1, collected by the CMS detector at the LHC. The search signatures involve either two charged leptons of the same flavor (electrons or muons) and at least two jets or a single charged lepton (electron or muon), missing ...Journal Article -
Search for Signatures of Extra Dimensions in the Diphoton Mass Spectrum at the Large Hadron Collider
(2012)Physical Review LettersA search for signatures of extra spatial dimensions in the diphoton invariant-mass spectrum has been performed with the CMS detector at the LHC. No excess of events above the standard model expectation is observed using a data sample collected in proton-proton collisions at √s=7 TeV corresponding to an integrated luminosity of 2.2 fb−1. In the context of the large-extra-dimensions model, lower limits are set on the effective Planck scale ...Journal Article