We present measurements of the branching fraction and time-dependent CP asymmetries in B-0 -> J/psi pi(0) decays based on 466x10(6) Gamma(4S)-> B (B) over bar events collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. We measure the CP asymmetry parameters S=-1.23 +/- 0.21(stat) +/- 0.04(syst) and C=-0.20 +/- 0.19(stat)+/- 0.03(syst), where the measured value of (S, C) is 4.0 standard deviations from (0, 0) including systematic uncertainties. The branching fraction is determined to be B(B-0 -> J/psi pi(0))=[1.69 +/- 0.14(stat)+/- 0.07(syst)]x10(-5).

Evidence for CP violation in B-0 -> J/psi pi(0) decays

ANDREOTTI, Mirco;CALABRESE, Roberto;CECCHI, Annalisa;CIBINETTO, Gianluigi;FRANCHINI, Paolo;LUPPI, Eleonora;NEGRINI, Matteo;PETRELLA, Antonio;SANTORO, Valentina;
2008

Abstract

We present measurements of the branching fraction and time-dependent CP asymmetries in B-0 -> J/psi pi(0) decays based on 466x10(6) Gamma(4S)-> B (B) over bar events collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. We measure the CP asymmetry parameters S=-1.23 +/- 0.21(stat) +/- 0.04(syst) and C=-0.20 +/- 0.19(stat)+/- 0.03(syst), where the measured value of (S, C) is 4.0 standard deviations from (0, 0) including systematic uncertainties. The branching fraction is determined to be B(B-0 -> J/psi pi(0))=[1.69 +/- 0.14(stat)+/- 0.07(syst)]x10(-5).
2008
B., Aubert; M., Bona; Y., Karyotakis; J. P., Lees; V., Poireau; E., Prencipe; X., Prudent; V., Tisserand; J. G., Tico; E., Grauges; L., Lopez; A., Pal...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/533264
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