Study of $B^{\pm} \to J/\psi \pi^+/-$ and $B^{\pm} \to J/\psi K^{\pm}$ decays: measurement of the ratio of branching fractions and search for direct CP violation - Archive ouverte HAL Access content directly
Journal Articles Physical Review Letters Year : 2004

Study of $B^{\pm} \to J/\psi \pi^+/-$ and $B^{\pm} \to J/\psi K^{\pm}$ decays: measurement of the ratio of branching fractions and search for direct CP violation

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J M. Roney
  • Function : Author
H R. Band
  • Function : Author
S. Dasu
  • Function : Author
M. Datta
  • Function : Author
a M. Eichenbaum
  • Function : Author
J R. Johnson
  • Function : Author
P E. Kutter
  • Function : Author
H. Li
  • Function : Author
R. Liu
  • Function : Author
F. Di Lodovico
  • Function : Author
A. Mihalyi
  • Function : Author
a K. Mohapatra
  • Function : Author
Y. Pan
  • Function : Author
R. Prepost
  • Function : Author
S J. Sekula
  • Function : Author
J H. von Wimmersperg-Toeller
  • Function : Author
J. Wu
  • Function : Author
Lan. Wu Sau
  • Function : Author
Z. Yu
  • Function : Author
H. Neal
  • Function : Author

Abstract

We study B^+/- --> J/psi pi^+/- and B^+/- --> J/psi K^+/- decays in a sample of about 89 million BB~ pairs collected with the BABAR detector at the PEP-II asymmetric B-factory at SLAC. We observe a signal of 244 +/- 20 B^+/- --> J/psi pi^+/- events and determine the ratio BF(B^+/- --> J/psi pi^+/-)/BF(B^+/- --> J/psi K^+/-) to be [5.37 +/- 0.45 (stat.) +/- 0.11 (syst)]%. The charge asymmetries for the B^+/- --> J/psi pi^+/- and B^+/- --> J/psi K^+/- decays are determined to be A_pi = 0.123 +/- 0.085 (stat.) +/- 0.004 (syst.) and A_K = 0.030 +/- 0.015 (stat.) +/- 0.006 (syst.), respectively.

Dates and versions

in2p3-00021940 , version 1 (27-07-2004)

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Cite

B. Aubert, R. Barate, D. Boutigny, F. Couderc, J.M. Gaillard, et al.. Study of $B^{\pm} \to J/\psi \pi^+/-$ and $B^{\pm} \to J/\psi K^{\pm}$ decays: measurement of the ratio of branching fractions and search for direct CP violation. Physical Review Letters, 2004, 92, pp.241802. ⟨in2p3-00021940⟩
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