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Determination of fs/fdf_s/f_d for 7 TeV7~\rm{TeV} pppp collisions and a measurement of the branching fraction of the decay Bd→D−K+B_d\to D^-K^+

Collaboration
Jun, 2011
7 pages
Published in:
  • Phys.Rev.Lett. 107 (2011) 211801
e-Print:
DOI:
Report number:
  • CERN-PH-EP-2011-075,
  • LHCB-PAPER-2011-006
Experiments:
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Abstract: (arXiv)
The relative abundance of the three decay modes Bd→D−K+B_d \to D^- K^+, Bd→D−π+B_d \to D^- \pi^+ and Bs→Ds−π+B_s \to D_s^- \pi^+ produced in 7 TeV pppp collisions at the LHC is determined from data corresponding to an integrated luminosity of 35 pb−1^{-1}. The branching fraction of Bd→D−K+B_d \to D^- K^+ is found to be B(Bd→D−K+)=(2.01±0.18stat±0.14syst)×10−4\cal B (B_d \to D^- K^+) = (2.01 \pm 0.18^{\textrm{stat}} \pm 0.14^{\textrm{syst}})\times 10^{-4}. The ratio of fragmentation fractions \fsfdt is determined through the relative abundance of Bs→Ds−π+B_s \to D_s^- \pi^+ to Bd→D−K+B_d \to D^- K^+ and Bd→D−π+B_d \to D^-\pi^+, leading to fs/fd=0.253±0.017±0.017±0.020f_s/f_d = 0.253 \pm 0.017 \pm 0.017 \pm 0.020, where the uncertainties are statistical, systematic, and theoretical respectively.
Note:
  • Submitted to PRL (7 pages, 2 Figures, 1 Table); Physical Review Letters, Vol.107, No.21, 2011
  • 13.87.Fh
  • 12.38.Qk
  • 13.60.Le
  • 13.25.Hw
  • B0: branching ratio: measured
  • p p: scattering
  • fragmentation
  • CERN LHC Coll
  • LHC-B
  • p p: interaction