29 research outputs found

    Search for vectorlike charge 2/3 T quarks in proton-proton collisions at root(s)=8 TeV

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    Measurement of spin correlations in tt production using the matrix element method in the muon plus jets final state in pp collisions at root S=8 TeV

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    Pseudorapidity distribution of charged hadrons in proton-proton collisions at root s=13TeV

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    Transverse momentum spectra of inclusive b jets in pPb collisions at √sNN=5.02 TeV

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    We present a measurement of b jet transverse momentum (pT) spectra in proton-lead (pPb) collisions using a dataset corresponding to about 35 nb−1 collected with the CMS detector at the LHC. Jets from b quark fragmentation are found by exploiting the long lifetime of hadrons containing a b quark through tagging methods using distributions of the secondary vertex mass and displacement. Extracted cross sections for b jets are scaled by the effective number of nucleon–nucleon collisions and are compared to a reference obtained from pythia simulations of pp collisions. The pythia -based estimate of the nuclear modification factor is found to be 1.22±0.15(stat+syst pPb)±0.27(syst pythia) averaged over all jets with pT between 55 and 400 GeV/c and with |ηlab|<2 . We also compare this result to predictions from models using perturbative calculations in quantum chromodynamics

    Angular analysis of the decay B0→K*0μ+μ- from pp collisions at s=8 TeV

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    The angular distributions and the differential branching fraction of the decay B0→K⁎(892)0μ+μ− 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 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 as a function of the dimuon invariant mass squared. The measurements are among the most precise to date and are in good agreement with standard model predictions

    Search for anomalous single top quark production in association with a photon in pp collisions at root s=8 TeV

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    Measurement of the CP-violating weak phase φs and the decay width difference δΓc using the Bs 0→J/ψφ(1020) decay channel in pp collisions at √ s=8 TeV

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    The CP-violating weak phase ϕsϕs of the View the MathML sourceBs0 meson and the decay width difference ΔΓsΔΓs of the View the MathML sourceBs0 light and heavy mass eigenstates are measured with the CMS detector at the LHC using a data sample of View the MathML sourceBs0→J/ψϕ(1020)→μ+μ−K+K− decays. The analysed data set corresponds to an integrated luminosity of View the MathML source19.7fb−1 collected in pp collisions at a centre-of-mass energy of View the MathML source8TeV. A total of 49 200 reconstructed View the MathML sourceBs0 decays are used to extract the values of ϕsϕs and ΔΓsΔΓs by performing a time-dependent and flavour-tagged angular analysis of the μ+μ−K+K−μ+μ−K+K− final state. The weak phase is measured to be View the MathML sourceϕs=−0.075±0.097(stat)±0.031(syst) rad, and the decay width difference is View the MathML sourceΔΓs=0.095±0.013(stat)±0.007(syst) ps−1

    CMS Collaboration

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    0info:eu-repo/semantics/publishe

    Searches for a heavy scalar boson H decaying to a pair of 125 GeV Higgs bosons hh or for a heavy pseudoscalar boson A decaying to Zh, in the final states with h -> tau tau

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    Search for a light charged Higgs boson decaying to (Formula presented.) in pp collisions at (Formula presented.) TeV

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    A search for a light charged Higgs boson, originating from the decay of a top quark and subsequently decaying into a charm quark and a strange antiquark, is presented. The data used in the analysis correspond to an integrated luminosity of 19.7 fb −1 recorded in proton-proton collisions at s = 8 s√=8 TeV by the CMS experiment at the LHC. The search is performed in the process t t ¯ → W ± b H ∓ b ¯ tt¯→W±bH∓b¯ , where the W boson decays to a lepton (electron or muon) and a neutrino. The decays lead to a final state comprising an isolated lepton, at least four jets and large missing transverse energy. No significant deviation is observed in the data with respect to the standard model predictions, and model-independent upper limits are set on the branching fraction ℬ t → H + b B(t→H+b) , ranging from 1.2 to 6.5% for a charged Higgs boson with mass between 90 and 160 GeV, under the assumption that ℬ H + → c s = 100 % B(H+→cs)=100%
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