31 research outputs found

    Search for supersymmetry in proton-proton collisions at 13 TeV using identified top quarks

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    A search for supersymmetry is presented based on proton-proton collision events containing identified hadronically decaying top quarks, no leptons, and an imbalance pTmissp_{T}^{miss} in transverse momentum. The data were collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV, and correspond to an integrated luminosity of 35.9 fb1^{−1}. Search regions are defined in terms of the multiplicity of bottom quark jet and top quark candidates, the pTmissp_{T}^{miss}, the scalar sum of jet transverse momenta, and the mT2m_{T2} mass variable. No statistically significant excess of events is observed relative to the expectation from the standard model. Lower limits on the masses of supersymmetric particles are determined at 95% confidence level in the context of simplified models with top quark production. For a model with direct top squark pair production followed by the decay of each top squark to a top quark and a neutralino, top squark masses up to 1020 GeV and neutralino masses up to 430 GeV are excluded. For a model with pair production of gluinos followed by the decay of each gluino to a top quark-antiquark pair and a neutralino, gluino masses up to 2040 GeV and neutralino masses up to 1150 GeV are excluded. These limits extend previous results

    Search for the X(5568) state decaying into B0sπ± in proton-proton collisions at s√= 8 TeV

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    Search for low mass vector resonances decaying into quark-antiquark pairs in proton-proton collisions at s=13 \sqrt{s}=13 TeV

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    The Phase-2 Upgrade of the CMS Tracker

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    This is the final version, approved by the LHCC, of the CMS TDR devoted to the upgrade of the CMS tracker in view of the HL-LHC running

    Search for the X(5568) state decaying into B0sπ± in proton-proton collisions at s√= 8 TeV

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    Search for Zγ resonances using leptonic and hadronic final states in proton-proton collisions at s√= 13 TeV

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    Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV

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    The nuclear modification factors of J/ψ\psi and ψ\psi(2S) mesons are measured in PbPb collisions at a centre-of-mass energy per nucleon pair of sNN=\sqrt{s_{\mathrm{NN}}} = 5.02 TeV. The analysis is based on PbPb and pp data samples collected by CMS at the LHC in 2015, corresponding to integrated luminosities of 464 μ\mub1^{-1} and 28 pb1^{-1}, respectively. The measurements are performed in the dimuon rapidity range of y<|y| < 2.4 as a function of centrality, rapidity, and transverse momentum (pT_\mathrm{T}) from pT=_\mathrm{T}= 3 GeV/cc in the most forward region and up to 50 GeV/cc. Both prompt and nonprompt (coming from b hadron decays) mesons are observed to be increasingly suppressed with centrality, with a magnitude similar to the one observed at sNN=\sqrt{s_{\mathrm{NN}}}= 2.76 TeV for the two J/ψ\psi meson components. No dependence on rapidity is observed for either prompt or nonprompt J/ψ\psi mesons. An indication of a lower prompt J/ψ\psi meson suppression at high pT_\mathrm{T} is seen with respect to that observed at intermediate pT_\mathrm{T}. The prompt ψ\psi(2S) meson yield is found to be more suppressed than that of the prompt J/ψ\psi mesons in the entire pT_\mathrm{T} range

    Azimuthal correlations for inclusive 2-jet, 3-jet, and 4-jet events in pp collisions at √s=13 TeV

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    Search for gauge-mediated supersymmetry in events with at least one photon and missing transverse momentum in pp collisions at s=\sqrt{s} = 13 TeV

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    Search for Zγ\gamma resonances using leptonic and hadronic final states in proton-proton collisions at s=\sqrt{s}= 13 TeV

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    A search is presented for resonances decaying to a Z boson and a photon. The analysis is based on data from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb1^{-1}, and collected with the CMS detector at the LHC in 2016. Two decay modes of the Z boson are investigated. In the leptonic channels, the Z boson candidates are reconstructed using electron or muon pairs. In the hadronic channels, they are identified using a large-radius jet, containing either light-quark or b quark decay products of the Z boson, via jet substructure and advanced b quark tagging techniques. The results from these channels are combined and interpreted in terms of upper limits on the product of the production cross section and the branching fraction to Zγ\gamma for narrow and broad spin-0 resonances with masses between 0.35 and 4.0 TeV, providing thereby the most stringent limits on such resonances
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