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Measurement of CP-violating asymmetries in B0 decays to CP eigenstates |
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| Authors: | Aubert B Boutigny D De Bonis I Gaillard J M Jeremie A Karyotakis Y Lees J P Robbe P Tisserand V Palano A Chen G P Chen J C Qi N D Rong G Wang P Zhu Y S Eigen G Reinertsen P L Stugu B Abbott B Abrams G S Borgland A W Breon A B Brown D N Button-Shafer J Cahn R N Clark A R Dardin S Day C Dow S F Elioff T Fan Q Gaponenko I Gill M S Goozen F R Gowdy S J Gritsan A Groysman Y Jacobsen R G Jared R C Kadel R W Kadyk J Karcher A Kerth L T Kipnis I Kluth S Kolomensky Y G Kral J F Lafever R LeClerc C Levi M E Lewis S A Lionberger C Liu T Long M Lynch G Marino M Marks K Meyer A B Mokhtarani A Momayezi M |
| Institution: | Laboratoire de Physique des Particules, Annecy-le-Vieux, France. |
| Abstract: | We present measurements of time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurement uses a data sample of 23x10(6) Upsilon(4S)-->BbarB decays collected by the BABAR detector at the PEP-II asymmetric B Factory at SLAC. In this sample, we find events in which one neutral B meson is fully reconstructed in a CP eigenstate containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2beta, is derived from the decay time distributions in such events. The result is sin2beta = 0.34+/-0.20 (stat)+/-0.05 (syst). |
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