Search
Results
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Event generator tunes obtained from underlying event and multiparton scattering measurements
(2016)The European Physical Journal CNew sets of parameters (“tunes”) for the underlying-event (UE) modelling of the pythia8, pythia6 and herwig++ Monte Carlo event generators are constructed using different parton distribution functions. Combined fits to CMS UE proton–proton (pp) data at s√=7TeV and to UE proton–antiproton (pp¯¯¯) data from the CDF experiment at lower s√, are used to study the UE models and constrain their parameters, providing thereby improved predictions ...Journal Article -
Search for direct pair production of supersymmetric top quarks decaying to all-hadronic final states in pp collisions at √s = 8 TeV
(2016)The European Physical Journal CResults are reported from a search for the pair production of top squarks, the supersymmetric partners of top quarks, in final states with jets and missing transverse momentum. The data sample used in this search was collected by the CMS detector and corresponds to an integrated luminosity of 18.9fb-1 of proton-proton collisions at a centre-of-mass energy of 8TeV produced by the LHC. The search features novel background suppression and ...Journal Article -
Measurement of tt¯ production with additional jet activity, including b quark jets, in the dilepton decay channel using pp collisions at √s = 8TeV
(2016)The European Physical Journal CJet multiplicity distributions in top quark pair (tt¯) events are measured in pp collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC using a data set corresponding to an integrated luminosity of 19.7fb-1. The measurement is performed in the dilepton decay channels (e+e−, μ+μ−, and e±μ∓). The absolute and normalized differential cross sections for tt¯ production are measured as a function of the jet multiplicity ...Journal Article -
Angular analysis of the decay B0→K*0μ+μ- from pp collisions at √s=8 TeV
(2016)Physics Letters BThe angular distributions and the differential branching fraction of the decay B-0 -> K*(892)(0)mu(+)mu(-) are studied using data corresponding to an integrated luminosity of 20.5 fb(-1) collected with the CMS detector at the LHC in pp collisions at root s = 8 TeV. From 1430 signal decays, the forward-backward asymmetry of the muons, the K*(892)(0) longitudinal polarization fraction, and the differential branching fraction are determined ...Journal Article -
Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton + jets final states produced in pp collisions at s√= 8TeV
(2016)Physics Letters BThe W boson helicity fractions from top quark decays in t (t) over bar events are measured using data from proton-proton collisions at a centre-of-mass energy of 8 TeV. The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8 fb(-1). Events are reconstructed with either one muon or one electron, along with four jets in the final state, with two of the jets being identified as ...Journal Article -
Search for neutral resonances decaying into a Z boson and a pair of b jets or τ leptons
(2016)Physics Letters BA search is performed for a new resonance decaying into a lighter resonance and a Z boson. Two channels are studied, targeting the decay of the lighter resonance into either a pair of oppositely charged τ leptons or a bb‾ pair. The Z boson is identified via its decays to electrons or muons. The search exploits data collected by the CMS experiment at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.8 fb−1. ...Journal Article -
Search for a Higgs boson decaying into γ*γ → llγ with low dilepton mass in pp collisions at √s = 8 TeV
(2016)Physics Letters BA search is described for a Higgs boson decaying into two photons, one of which has an internal conversion to a muon or an electron pair (ℓℓγ). The analysis is performed using proton-proton collision data recorded with the CMS detector at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. The events selected have an opposite-sign muon or electron pair and a high transverse momentum photon. ...Journal Article -
Combined search for anomalous pseudoscalar HVV couplings in VH(H→bb‾) production and H → VV decay
(2016)Physics Letters BA search for anomalous pseudoscalar couplings of the Higgs boson H to electroweak vector bosons V (=W or Z) in a sample of proton–proton collision events corresponding to an integrated luminosity of 18.9 fb−1 at a center-of-mass energy of 8 TeV is presented. Events consistent with the topology of associated VH production, where the Higgs boson decays to a pair of bottom quarks and the vector boson decays leptonically, are analyzed. The ...Journal Article -
Search for supersymmetry in events with soft leptons, low jet multiplicity, and missing transverse energy in proton–proton collisions at √s=8TeV
(2016)Physics Letters BResults are presented from a search for supersymmetric particles in scenarios with small mass splittings. The data sample corresponds to 19.7 fb−1 of proton–proton collisions recorded by the CMS experiment at s=8 TeV. The search targets top squark (t˜) pair production in scenarios with mass differences Δm=m(t˜)−m(χ˜1 0) below the W-boson mass and with top-squark decays in the four-body mode (t˜→bℓνχ˜1 0), where the neutralino (χ˜1 0) is ...Journal Article -
Measurements of tt‾ charge asymmetry using dilepton final states in pp collisions at s=8TeV
(2016)Physics Letters BThe charge asymmetry in tt‾ events is measured using dilepton final states produced in pp collisions at the LHC at s=8TeV. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.5fb−1. The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The charge ...Journal Article