Measurement of the ratio of branching fractions BF(B^+/- --> J/psi pi^+/-)/BF(B^+/- --> J/psi K^+/-)

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  • 3 August 2001
Abstract
We present a measurement of the ratio of branching fractions BF(B^+/- --> J/psi pi^+/-)/BF(B^+/- --> J/psi K^+/-). The data were collected in 1999-2000 with the BABAR detector at the PEP-II asymmetric B Factory at SLAC and correspond to an integrated luminosity of 20.7 fb^{-1}. We observe a signal of 51 +/- 10 B^+/- --> J/psi pi^+/- events and determine the ratio BF(B^+/- --> J/psi pi^+/-)/BF(B^+/- --> J/psi K^+/-) to be [3.91+/-0.78 (stat.) +/-0.19 (syst.)]%.

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