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标题：Direct CPV and charmless B decays at Belle
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作者：P. CHANG
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2011
卷号：2011
期号：EPS-HEP2011
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report measurements of branching fractions and direct CP violating asymmetries for B meson decays to pseudoscalar-pseudoscalar final states based on a data sample of 772 million BB pairs collected at the ¡(4S) resonance with the Belle detector at the KEKB asymmetricenergy e+e− collider. The difference of CP asymmetry between the decays B± ! K±p 0 and B0 ! K±p is measured to be DAKp = 0.112±0.028 with a significance of 4.0s , which is sensitive to new physics in the electro-magnetic penguin loop, The obtained partial width ratios of B!Kp , variables that probe new physics also in the electro-magnetic penguin loop, are Rc = 1.05±0.03±0.05 and Rn = 1.04±0.05±0.06. Furthermore, we see the evidences of direct CP violation for both B± !hK± and B± !hp±; the corresponding asymmetries are ACP(B± !hK±) = −0.38±0.11±0.01 and ACP(B± !hp±) = −0.19±0.06±0.01with significances of 3.8s and 3.0s , respectively. We also observe the decay B0 !hK0 for the first time and the the branching fraction is measured to beB(B0 !hK0) = (1.27+0.33 −0.29±0.08)×10−6 with a significance of 5.4s .