We study B±→J/ψπ± and B±→J/ψK± decays in a sample of about 89×10^6 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.
Study of B±→J/ψπ± and B±→J/ψK± Decays: Measurement of the Ratio of Branching Fractions and Search for Direct CP Violation
MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;SIMI, GABRIELE;
2004
Abstract
We study B±→J/ψπ± and B±→J/ψK± decays in a sample of about 89×10^6 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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