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Phys. Rev. Lett. 89, 201802 (2002) [7 pages]

Measurement of the CP Asymmetry Amplitude sin⁡2β with B0 Mesons

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B. Aubert et al. The BABAR Collaboration
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Received 17 July 2002; revised 6 September 2002; published 29 October 2002

We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88×106 Υ(4S)→BB̅ decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We study 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 B̅ 0 from its decay products. The amplitude of the CP asymmetry, which in the standard model is proportional to sin⁡2β, is derived from the decay-time distributions in such events. We measure sin⁡2β=0.741±0.067(stat)±0.034(syst) and |λ|=0.948±0.051(stat)±0.030(syst). The magnitude of λ is consistent with unity, in agreement with the standard model expectation of no direct CP violation in these modes.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.201802
DOI:
10.1103/PhysRevLett.89.201802
PACS:
13.25.Hw, 11.30.Er, 12.15.Hh
 
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