Improved measurement of CP asymmetries in B0 --> (cc)K(0(*)) decays.

Journal article

We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 227 x 10(6) upsilon(4S) --> BB decays collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. The amplitude of the CPasymmetry, sin2beta in the standard model, is derived from decay-time distributions from events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B0 or B0 from its decay products. We measure sin2beta = 0.722 +/- 0.040(stat) +/- 0.023(syst) in agreement with the standard model expectation.

Authors: Aubert, B; Barate, R; Boutigny, D; Couderc, F; Gaillard, J

• Publication status: Published
• Journal: Physical Review Letters
• Volume: 94
• Issue: 16
• Pages: 161803
• Publication date: 2005-04-01
• DOI: 10.1103/physrevlett.94.161803
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English
• Keywords: BABAR Collaboration