5 research outputs found

    Measurements of the associated production of a Z boson and b jets in pp collisions at root s=8 TeV

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    Measurement of the jet mass in highly boosted ttt\overline{t} events from pp collisions at √s=8TeV

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    The first measurement of the jet mass m jet of top quark jets produced in tt ¯ events from pp collisions at s √s =8 TeV is reported for the jet with the largest transverse momentum p T in highly boosted hadronic top quark decays. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.7fb −1. The measurement is performed in the lepton+jets channel in which the products of the semileptonic decay t→bW with W→ℓν where ℓ is an electron or muon, are used to select tt ¯ events with large Lorentz boosts. The products of the fully hadronic decay t→bW with W→qq ¯′ are reconstructed using a single Cambridge–Aachen jet with distance parameter R=1.2 and p T >400 GeV. The tt ¯ cross section as a function of m jet is unfolded at the particle level and is used to test the modelling of highly boosted top quark production. The peak position of the m jet distribution is sensitive to the top quark mass m t mt, and the data are used to extract a value of m t to assess this sensitivity

    Measurements of the associated production of a Z boson and b jets in pp collisions at √s = 8TeV

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    Measurements of the associated production of a Z boson with at least one jet originating from a b quark in proton–proton collisions at √s =8TeV are presented. Differential cross sections are measured with data collected by the CMS experiment corresponding to an integrated luminosity of 19.8fb⁻¹. Z bosons are reconstructed through their decays to electrons and muons. Cross sections are measured as a function of observables characterizing the kinematics of the b jet and the Z boson. Ratios of differential cross sections for the associated production with at least one b jet to the associated production with any jet are also presented. The production of a Z boson with at least two b jets is investigated, and differential cross sections are measured for the dijet system. Results are compared to theoretical predictions, testing two different flavour schemes for the choice of initial-state partons

    Measurements of the associated production of a Z boson and b jets in pp collisions at 1as=8 TeV

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    Measurements of the associated production of a Z boson and b jets in pp collisions at √s=8TeV

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    Measurements of the associated production of a Z boson with at least one jet originating from a b quark in proton–proton collisions at s=8TeV are presented. Differential cross sections are measured with data collected by the CMS experiment corresponding to an integrated luminosity of 19.8fb-1. Z bosons are reconstructed through their decays to electrons and muons. Cross sections are measured as a function of observables characterizing the kinematics of the b jet and the Z boson. Ratios of differential cross sections for the associated production with at least one b jet to the associated production with any jet are also presented. The production of a Z boson with at least two b jets is investigated, and differential cross sections are measured for the dijet system. Results are compared to theoretical predictions, testing two different flavour schemes for the choice of initial-state partons. © 2017, CERN for the benefit of the CMS collaboration
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