Evidence for Direct CP Violation in B0K+πDecays

Y. Chao et al. (Belle Collaboration)
Phys. Rev. Lett. 93, 191802 – Published 5 November 2004

Abstract

We report evidence for direct CP violation in the decay B0K+π with 253fb1 of data collected with the Belle detector at the KEKB e+e collider. Using 275×106 BB¯ pairs we observe a BK±π signal with 2140±53 events. The measured CP violating asymmetry is ACP(K+π)=0.101±0.025(stat)±0.005(syst), corresponding to a significance of 3.9σ including systematics. We also search for CP violation in the decays B+K+π0 and B+π+π0. The measured CP violating asymmetries are ACP(K+π0)=0.04±0.05(stat)±0.02(syst) and ACP(π+π0)=0.02±0.10(stat)±0.01(syst), corresponding to the intervals 0.05<ACP(K+π0)<0.13 and 0.18<ACP(π+π0)<0.14 at 90% confidence level.

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  • Received 20 August 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.191802

©2004 American Physical Society

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Vol. 93, Iss. 19 — 5 November 2004

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