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Phys. Rev. Lett. 93, 071801 (2004) [7 pages]

Measurement of the Time-Dependent CP Asymmetry in the B0ϕK0 Decay

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B. Aubert et al. BABAR Collaboration
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Received 15 March 2004; published 10 August 2004

We present a measurement of the time-dependent CP asymmetry for the neutral B-meson decay B0ϕK0. We use a sample of approximately 114×106 B-meson pairs taken at the Υ(4S) resonance with the BABAR detector at the PEP-II B-meson factory at SLAC. We reconstruct the CP eigenstates ϕKS0 and ϕKL0, where ϕK+K-, KS0π+π-, and KL0 is observed via its hadronic interactions. The other B meson in the event is tagged as either a B0 or B̅ 0 from its decay products. The values of the CP-violation parameters are SϕK=0.47±0.34(stat)-0.06+0.08(syst) and CϕK=0.01±0.33(stat)±0.10(syst).

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.071801
DOI:
10.1103/PhysRevLett.93.071801
PACS:
13.25.Hw, 11.30.Er, 12.15.Hh