A study of B+/- --> J/psi pi+/- and B+/- --> J/psi K+/- decays: measurement of the ratio of branching fractions and search for direct CP-violating charge asymmetries
B. Aubert
Abstract
We have studied the B+/- --> J/psi pi+/- and B+/- --> J/psi K+/- decays using a 20.7 fb-1 data set collected with the BABAR detector. 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.)]%. The CP-violating charge asymmetries for the B+/- --> J/psi pi+/- and B+/- --> J/psi K+/- decays are determined to be Api = 0.01 +/- 0.22 (stat.) +/- 0.01 (syst.) and AK = 0.003 +/- 0.030 (stat.) +/- 0.004 (syst.).
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