Improved Measurement of the Partial-Rate CP Asymmetry in B+ -> K0pi+ and B- -> K0bar pi- Decays

Abstract

We report an improved measurement of the partial-rate CP asymmetry in B+ => K0pi+ and B- => K0bar pi- decays. The analysis is based on a data sample of 85 million BBbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB e+ e- storage ring. We measure Acp(K0pi+-) = 0.07^{+0.09 +0.01}_{-0.08 -0.03}, where the first and second errors are statistical and systematic, respectively; the corresponding 90% confidence-level interval is -0.10 < Acp(K0pi+-) < 0.22 .

7 pages, 8 figures, submitted to Phys. Rev. D

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• Large electroweak penguin contribution in B -> K pi and pi pi decay modes
• A Possibility of large electro-weak penguin contribution in B -> K pi modes
• Two-Body Charmless B Decays Involving eta and eta'
• Improved Measurements of Branching Fractions for B->Kpi, pipi and KK Decays
• $B\to \eta ({\eta }^{\prime })K(\pi )$ in the Standard Model with Flavor Symmetry
• Observing Direct CP Violation in Untagged B-Meson Decays
• Improved Measurements of Partial Rate Asymmetry in B -> h h Decays
• Measurements of Branching Fractions and CP-Violating Asymmetries in B Meson Decays to Charmless Two-Body States Containing a K0
• Elastic and inelastic SU(3)-breaking final-state interactions in B decays to pseudoscalar mesons