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Phys. Rev. Lett. 93, 131801 (2004) [7 pages]

Direct CP Violating Asymmetry in B0K+π- Decays

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B. Aubert et al. BABAR Collaboration
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Received 30 July 2004; published 20 September 2004

We present a measurement of the direct CP violating asymmetry in the decay B0K+π- using a data sample of 227×106 Υ(4S)→BB̅ decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We observe a total signal yield of nK-π++nK+π-=1606±51 decays and measure the asymmetry (nK-π+-nK+π-)/(nK-π++nK+π-)=-0.133±0.030(stat)±0.009(syst). The probability of observing such an asymmetry in the absence of direct CP violation is 1.3×10-5, corresponding to 4.2 standard deviations.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.131801
DOI:
10.1103/PhysRevLett.93.131801
PACS:
13.25.Hw, 11.30.Er, 12.15.Hh