Aubert, B. et al. (2004) Study of B±→J/ψπ± and B±→J/ψK± Decays: Measurement of the Ratio of Branching Fractions and Search for Direct CP Violation. Physical Review Letters, 92 (24). p. 241802. ISSN 0031-9007

We study B±→J/ψπ± and B±→J/ψK± decays in a sample of about 89×106 BB̅ pairs collected with the BABAR detector at the PEP-II asymmetric B factory at SLAC. We observe a signal of 244±20 B±→J/ψπ± events and determine the ratio B(B±→J/ψπ±)/B(B±→J/ψK±) to be [5.37±0.45(stat)±0.11(syst)]%. The charge asymmetries for the B±→J/ψπ± and B±→J/ψK± decays are determined to be Aπ=0.123±0.085(stat)±0.004(syst) and AK=0.030±0.015(stat)±0.006(syst), respectively.

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