Measurement of associated Z + charm production in proton–proton collisions at √s = 8 TeV
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Author(s)
Sirunyan, A. M
Tumasyan, A.
Adam, W.
Ambrogi, F.
Asilar, E.
Bergauer, T.
Brandstetter, J.
Brondolin, E.
Dragicevic, M.
Erö, J.
Date Issued
April 2018
Journal
European Physical Journal C: Particles and Fields
Publisher
Springer Berlin Heidelberg
Citation
Sirunyan, A. M. et al. "Measurement of associated Z + charm production in proton–proton collisions at √s = 8 TeV." European Physical Journal C 78 (April 2018): 287 © 2018 CERN for the benefit of the CMS collaboration
Version
Final published version
Abstract
A study of the associated production of a Z boson and a charm quark jet (
Z + c), and a comparison to production with a b quark jet (Z + b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb⁻¹, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with p [subscript T][superscript ℓ] > 20 GeV, |η[superscript ℓ]| < 2.1, 71 < m[subscript ℓℓ] < 111 GeV, and heavy flavour jets with p[subscript T][superscript jet] > 25 GeV and | η[superscript jet] | < 2.5. The Z + c production cross section is measured to be σ(pp → Z + c + X) B(Z → ℓ+ℓ-) = 8.8 ± 0.5 (stat) ± 0.6 (syst) pb. The ratio of the Z + c and Z + b production cross sections is measured to be σ(pp → Z + c + X)/σ(pp → Z + b + X) = 2.0 ± 0.2 (stat) ± 0.2 (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions. Keywords: CMS; Physics; SMP; Vector boson; Heavy flavour; Standard model physics
Z + c), and a comparison to production with a b quark jet (Z + b), in pp collisions at a centre-of-mass energy of 8 TeV are presented. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb⁻¹, collected with the CMS detector at the CERN LHC. The Z boson candidates are identified through their decays into pairs of electrons or muons. Jets originating from heavy flavour quarks are identified using semileptonic decays of c or b flavoured hadrons and hadronic decays of charm hadrons. The measurements are performed in the kinematic region with two leptons with p [subscript T][superscript ℓ] > 20 GeV, |η[superscript ℓ]| < 2.1, 71 < m[subscript ℓℓ] < 111 GeV, and heavy flavour jets with p[subscript T][superscript jet] > 25 GeV and | η[superscript jet] | < 2.5. The Z + c production cross section is measured to be σ(pp → Z + c + X) B(Z → ℓ+ℓ-) = 8.8 ± 0.5 (stat) ± 0.6 (syst) pb. The ratio of the Z + c and Z + b production cross sections is measured to be σ(pp → Z + c + X)/σ(pp → Z + b + X) = 2.0 ± 0.2 (stat) ± 0.2 (syst). The Z+c production cross section and the cross section ratio are also measured as a function of the transverse momentum of the Z boson and of the heavy flavour jet. The measurements are compared with theoretical predictions. Keywords: CMS; Physics; SMP; Vector boson; Heavy flavour; Standard model physics
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-018-5752-x
