23 research outputs found

    Event shapes and azimuthal correlations in Z plus jets events in pp collisions at root √s=7TeV^{√s=7 TeV}

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    is produced in association with jets in proton–proton collisions. The data collected with the CMS detector at the CERN LHC at √s=7TeV^{√s=7 TeV} correspond to an integrated luminosity of 5.0 fb−1^{-1}. The analysis provides a test of predictions from perturbative QCD for a process that represents a substantial background to many physics channels. Results are presented as a function of jet multiplicity, for inclusive Z boson production and for Z bosons with transverse momenta greater than 150 GeV, and compared to predictions from Monte Carlo event generators that include leading-order multiparton matrix-element (with up to four hard partons in the final state) and next-to-leading-order simulations of Z+1-jet events. The experimental results are corrected for detector effects, and can be compared directly with other QCD model

    Search for a Higgs boson in the mass range from 145 to 1000 GeV decaying to a pair of W or Z bosons

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    Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions at root s(NN)=2.76 TeV

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    An analysis of dijet events in PbPb and pp collisions is performed to explore the properties of energy loss by partons traveling in a quark-gluon plasma. Data are collected at a nucleon-nucleon center-of-mass energy of 2.76 TeV at the LHC. The distribution of transverse momentum (p(T)) surrounding dijet systems is measured by selecting charged particles in different ranges of p(T) and at different angular cones of pseudorapidity and azimuth. The measurement is performed as a function of centrality of the PbPb collisions, the p(T) asymmetry of the jets in the dijet pair, and the distance parameter R used in the anti-k(T) jet clustering algorithm. In events with unbalanced dijets, PbPb collisions show an enhanced multiplicity in the hemisphere of the subleading jet, with the p(T) imbalance compensated by an excess of low-p(T) particles at large angles from the jet axes

    Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions at root s(NN)=2.76 TeV

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    An analysis of dijet events in PbPb and pp collisions is performed to explore the properties of energy loss by partons traveling in a quark-gluon plasma. Data are collected at a nucleon-nucleon center-of-mass energy of 2.76 TeV at the LHC. The distribution of transverse momentum (p(T)) surrounding dijet systems is measured by selecting charged particles in different ranges of p(T) and at different angular cones of pseudorapidity and azimuth. The measurement is performed as a function of centrality of the PbPb collisions, the p(T) asymmetry of the jets in the dijet pair, and the distance parameter R used in the anti-k(T) jet clustering algorithm. In events with unbalanced dijets, PbPb collisions show an enhanced multiplicity in the hemisphere of the subleading jet, with the p(T) imbalance compensated by an excess of low-p(T) particles at large angles from the jet axes

    Measurements of <tex>t\bar{t}</tex>chargeasymmetryusingdileptonfinalstatesinppcollisionsat<tex>s</tex> charge asymmetry using dilepton final states in pp collisions at <tex>\sqrt{s}</tex>=8 TeV

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    Search for a pseudoscalar boson decaying into a Z boson and the 125 GeV Higgs boson in l(+)l(-)b(b)over-bar final states

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    Results are reported on a search for decays of a pseudoscalar A boson into a Z boson and a light scalar h boson, where the Z boson decays into a pair of oppositely-charged electrons or muons, and the h boson decays into bb. The search is based on data from proton-proton collisions at a center-of-mass energy root s = 8 TeV collected with the CMS detector, corresponding to an integrated luminosity of 19.7 fb(-1). The h boson is assumed to be the standard model-like Higgs boson with a mass of 125 GeV. With no evidence for signal, upper limits are obtained on the product of the production cross section and the branching fraction of the A boson in the Zh channel. Results are also interpreted in the context of two Higgs doublet models. (C) 2015 CERN for the benefit of the CMS Collaboration. Published by Elsevier B.V

    Search for a pseudoscalar boson decaying into a Z boson and the 125 GeV Higgs boson in <tex>\ell^{+}\ell^{-}b\bar{b}$</tex> final states

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    Angular coefficients of Z bosons produced in pp collisions at <tex>\sqrt{s}</tex>=8TeVanddecayingto<tex>μ+μ−</tex>=8 TeV and decaying to <tex>\mu^{+}\mu^{-}</tex> as a function of transverse momentum and rapidity

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    Measurement of the hadronic activity in events with a Z and two jets and extraction of the cross section for the electroweak production of a Z with two jets in pp collisions at root s=7 TeV

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    Search for heavy Majorana neutrinos in <tex>\mu^{\pm}\mu^{\pm}+</tex>jetseventsinproton−protoncollisionsat<tex>s=8</tex> jets events inproton-proton collisions at <tex>\sqrt{s}=8</tex>TeV

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