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We have studied the B^+/- --> J/psi pi^+/- and B^+/- --> J/psi K^+/- decaysusing a 20.7 fb-1 data set collected with the BABAR detector. We observe asignal of 51+/-10 B^+/- --> J/psi pi^+/- events and determine the ratioBF(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 A_pi =0.01 +/- 0.22 (stat.) +/- 0.01 (syst.) and A_K = 0.003 +/- 0.030 (stat.) +/-0.004 (syst.).

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mo>→</mml:mo><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:…

Study ofB±→J/ψπ±and