Measurement of the ratio of the production cross sections times branching fractions of B±c → J/ψπ± and B± → J/ψK± and B(B±c → J/ψπ±π±π±)/B(B±c → J/ψπ±) in pp collisions at √s = 7 TeV

CMS Collaboration

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The ratio of the production cross sections times branching fractions (σ(B±c)B(B±c → J/ψπ±))/(σ(B±)B(B± → J/ψK±)) is studied in proton-proton collisions at a center-of-mass energy of 7 TeV with the CMS detector at the LHC. The kinematic region investigated requires B±c and B± mesons with transverse momentum pT > 15 GeV and rapidity |y| < 1.6. The data sample corresponds to an integrated luminosity of 5.1 fb−1. The ratio is determined to be [0.48 ± 0.05 (stat) ± 0.03 (syst) ± 0.05 (τBc)]%. The B±c → J/ψπ±π±π± decay is also observed in the same data sample. Using a model-independent method developed to measure the efficiency given the presence of resonant behaviour in the three-pion system, the ratio of the branching fractions B(B±c → J/ψπ±π±π±)/B(B±c → J/ψπ±) is measured to be 2.55±0.80 (stat) ±0.33 (syst)+0.04−0.01Bc), consistent with the previous LHCb result.
Original languageEnglish
Article number63
Number of pages30
JournalJournal of High Energy Physics
Issue number1
Publication statusPublished - 2015
Externally publishedYes


  • Hadron-Hadron Scattering
  • Branching fraction
  • B physics

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