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Evidence for CP violation in B0-->J/psipi0 decays |
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| Authors: | Aubert B Bona M Karyotakis Y Lees J P Poireau V Prencipe E Prudent X Tisserand V Tico J Garra Grauges E Lopez L Palano A Pappagallo M Eigen G Stugu B Sun L Abrams G S Battaglia M Brown D N Button-Shafer J Cahn R N Jacobsen R G Kadyk J A Kerth L T Kolomensky Yu G Kukartsev G Lynch G Osipenkov I L Ronan M T Tackmann K Tanabe T Wenzel W A Hawkes C M Soni N Watson A T Koch H Schroeder T Walker D Asgeirsson D J Cuhadar-Donszelmann T Fulsom B G Hearty C Mattison T S McKenna J A Barrett M Khan A Saleem M Teodorescu L Blinov V E Bukin A D Buzykaev A R Druzhinin V P Golubev V B Onuchin A P |
| Affiliation: | Laboratoire de Physique des Particules, IN2P3/CNRS et Université de Savoie, F-74941 Annecy-Le-Vieux, France. |
| Abstract: | We present measurements of the branching fraction and time-dependent CP asymmetries in B0-->J/psipi0 decays based on 466 x 10(6) Upsilon(4S)-->BB over 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(B0-->J/psipi0)=[1.69+/-0.14(stat)+/-0.07(syst)]x10(-5). |
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