Direct CP Violating Asymmetry in B0K+π Decays

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. Lett. 93, 131801 – Published 20 September 2004

Abstract

We present a measurement of the direct CP violating asymmetry in the decay B0K+π using a data sample of 227×106 Υ(4S)BB¯ decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e collider at SLAC. We observe a total signal yield of nKπ++nK+π=1606±51 decays and measure the asymmetry (nKπ+nK+π)/(nKπ++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 1.3×105, corresponding to 4.2 standard deviations.

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  • Received 30 July 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.131801

©2004 American Physical Society

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Vol. 93, Iss. 13 — 24 September 2004

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