Measurement of CP-violating asymmetries in B° decays to CP Eigenstates

B Aubert, Paul Bright-Thomas, Theresa Harrison, Christopher Hawkes, Andrew Kirk, David Knowles, Stephen O'Neale, Alan Watson, Nigel Watson

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140 Citations (Scopus)


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).
Original languageEnglish
Pages (from-to)2515-2522
Number of pages8
JournalPhysical Review Letters
Issue number12
Early online date1 Mar 2001
Publication statusPublished - 1 Mar 2001


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