Measurement of the fragmentation fraction ratio fs/fd and its dependence on B meson kinematics

The Lhcb Collaboration

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The relative production rate of B0 s and B0 mesons is determined with the hadronic decays B0 s → D sπ+ and B0 → DK+. The measurement uses data corresponding to 1.0 fb−1 of pp collisions at a centre-of-mass energy of √s = 7TeV recorded in the forward region with the LHCb experiment. The ratio of production rates, fs/fd, is measured to be 0.238 ± 0.004 ± 0.015 ± 0.021, where the first uncertainty is statistical, the second systematic, and the third theoretical. This is combined with a previous LHCb measurement to obtain fs/fd = 0.256 ±0.020. The dependence of fs/fd on the transverse momentum and pseudorapidity of the B meson is determined using the decays B0 s → D sπ+ and B0 → Dπ+. There is evidence for a decrease with increasing transverse momentum, whereas the ratio remains constant as a function of pseudorapidity. In addition, the ratio of branching fractions of the decays B0 → DK+ and B0 → Dπ+ is measured to be 0.0822 ± 0.0011 (stat) ± 0.0025 (syst).

Original languageEnglish (US)
Pages (from-to)1-16
Number of pages16
JournalJournal of High Energy Physics
Issue number4
StatePublished - 2013



  • B physics
  • Branching fraction
  • Flavor physics
  • Hadron-Hadron Scattering

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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