1,088 research outputs found

    Search for heavy gauge W ' bosons in events with an energetic lepton and large missing transverse momentum at root s=13TeV

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    Search for massive resonances decaying in to WW,WZ or ZZ bosons in proton-proton collisions at root s=13 TeV

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    Search for black holes and other new phenomena in high-multiplicity final states in proton-proton collisions at root s=13 TeV

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    Search for supersymmetry in events with photons and missing transverse energy in pp collisions at 13 TeV

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    Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search

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    Search for heavy resonances decaying into a vector boson and a Higgs boson in final states with charged leptons, neutrinos, and b quarks

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    Measurement of tt\mathrm {t}\overline{\mathrm {t}} t t ¯ production with additional jet activity, including b\mathrm {b} b quark jets, in the dilepton decay channel using pp collisions at s=8TeV\sqrt{s} = 8\,\text {TeV} s = 8 TeV

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    Jet multiplicity distributions in top quark pair ( tt{{\rm t}}{\rm {\overline{t}}} ) 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 19.7 fb-1\,\text {fb}^\text {-1} . The measurement is performed in the dilepton decay channels ( e+e\mathrm {e}^+\mathrm {e}^- , μ+μ\mathrm {\mu ^+}\mathrm {\mu ^-} , and e±μ\mathrm {e}^{\pm }\mathrm {\mu }^{\mp } ). The absolute and normalized differential cross sections for tt\mathrm {t}\overline{\mathrm {t}} production are measured as a function of the jet multiplicity in the event for different jet transverse momentum thresholds and the kinematic properties of the leading additional jets. The differential ttb\mathrm {\mathrm {t} \overline{\mathrm {t}} \mathrm {b}} and ttbb\mathrm {\mathrm {t} \overline{\mathrm {t}} \mathrm {b} \overline{\mathrm {b}}} cross sections are presented for the first time as a function of the kinematic properties of the leading additional b\mathrm {b} jets. Furthermore, the fraction of events without additional jets above a threshold is measured as a function of the transverse momenta of the leading additional jets and the scalar sum of the transverse momenta of all additional jets. The data are compared and found to be consistent with predictions from several perturbative quantum chromodynamics event generators and a next-to-leading order calculation

    Search for top squark pair production in pp collisions at root s=13 TeV using single lepton events

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    Measurements of the pp → ZZ production cross section and the Z → 4ℓ branching fraction, and constraints on anomalous triple gauge couplings at √s = 13 TeV

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    Four-lepton production in proton-proton collisions, pp -> (Z/gamma*)(Z/gamma*) -> 4l, where l = e or mu, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb(-1). The ZZ production cross section, sigma(pp -> ZZ) = 17.2 +/- 0.5 (stat) +/- 0.7 (syst) +/- 0.4 (theo) +/- 0.4 (lumi) pb, measured using events with two opposite-sign, same-flavor lepton pairs produced in the mass region 60 4l) = 4.83(-0.22)(+0.23) (stat)(-0.29)(+0.32) (syst) +/- 0.08 (theo) +/- 0.12(lumi) x 10(-6) for events with a four-lepton invariant mass in the range 80 4GeV for all opposite-sign, same-flavor lepton pairs. The results agree with standard model predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZ and ZZ. couplings at 95% confidence level: -0.0012 < f(4)(Z) < 0.0010, -0.0010 < f(5)(Z) < 0.0013, -0.0012 < f(4)(gamma) < 0.0013, -0.0012 < f(5)(gamma) < 0.0013
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