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Measurement of production cross sections times branching fraction of Bc+→J/ψπ+B_c^+ \rightarrow J/\psi \pi^+ and B+→J/ψK+B^+\rightarrow J/\psi K^+ in pp collisions at s=7 TeV\sqrt{s}=7~\mathrm{TeV} at CMS

Collaboration
2018
17 pages
Report number:
  • CMS-PAS-BPH-13-002
Experiments:
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Abstract:
Measurements of the differential production cross section times branching fraction of the Bc+→J/ψπ+B_c^+ \rightarrow J/\psi \pi^+ and B+→J/ψK+B^+\rightarrow J/\psi K^+ processes are presented as a function of the Bc+B_c^+(B+B^+) transverse momentum pTp_{T} and absolute rapidity ∣y∣|y|. The measurements are based on data collected by CMS in 20112011 in pp collisions at s=7 TeV\sqrt{s}=7~\mathrm{TeV}, corresponding to an integrated luminosity of 4.77 fb−14.77~\mathrm{fb^{-1}}. The integrated production cross sections times branching fraction in the kinematic region of pT(Bc+, B+)>10 GeV/cp_{T}(B_c^+,~B^+)>10~\mathrm{GeV}/c and ∣y∣(Bc+, B+)<1.5|y|(B_c^+,~B^+)<1.5 are measured to be 40.8±4.7 (stat.)±2.8 (syst.) pb40.8\pm4.7{\rm~(stat.)}\pm2.8{\rm~(syst.)}~\mathrm{pb} for Bc+→J/ψπ+B_c^+ \rightarrow J/\psi \pi^+ and 5851.3±37.1± (stat.)±446.4 (syst.) pb5851.3\pm37.1\pm{\rm~(stat.)}\pm446.4{\rm~(syst.)}~\mathrm{pb} for B+→J/ψK+B^+\rightarrow J/\psi K^+. The B+→J/ψK+B^+\rightarrow J/\psi K^+ production is found to be described reasonably well by FONLL theoretical calculations, while the shape of Bc+→J/ψπ+B_c^+ \rightarrow J/\psi \pi^+ production is described well by BCVEGPY theoretical predictions.
Note:
  • Preliminary results
  • Data
  • p p: scattering
  • p p: colliding beams
  • B/c+: hadronic decay
  • B+: hadronic decay
  • J/psi(3100)
  • channel cross section: branching ratio: measured
  • B+: transverse momentum
  • differential cross section: measured
  • CMS
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