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Phys. Rev. Lett. 86, 2515–2522 (2001)

Measurement of CP-Violating Asymmetries in B0 Decays to CP Eigenstates

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B. Aubert et al. (BABAR Collaboration)
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Received 12 February 2001; published in the issue dated 19 March 2001

We present measurements of time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurement uses a data sample of 23×106 ϒ(4S)→BB̅ 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 sin2β, is derived from the decay time distributions in such events. The result is sin2β = 0.34±0.20(stat)±0.05(syst).

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.2515
DOI:
10.1103/PhysRevLett.86.2515
PACS:
13.25.Hw, 12.15.Hh, 11.30.Er