Study of B+/- --> J/psi pi+/- and B+/- --> J/psi K+/- Decays: Measurement of the Ratio of Branching Fractions and Search for Direct CP Violation
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 Api = 0.123 +/- 0.085 (stat.) +/- 0.004 (syst.) and AK = 0.030 +/- 0.015 (stat.) +/- 0.006 (syst.), respectively.
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