文章基本信息

标题：Belle: Updated results on B -> Kpi/KK decays
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作者：Y. Chao
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2005
卷号：2005
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report an improved measurements of direct CP violation in the decay B0 !K+p􀀀 using 350 fb􀀀1 of data and measurements of B meson decays to two kaons using 253 fb􀀀1 of data. The measured CP violating asymmetries are ACP(K+p􀀀) = 􀀀0:113 0:022(stat:) 0:008(syst:), ACP(K+p0)=0:040:04(stat:)0:02(syst:) andACP(p+p0)=0:020:08(stat:)0:01(syst:), where the latter correspond to the intervals 􀀀0:03 < ACP(K+p0) < 0:11 and 􀀀0:12 < ACP(p+p0) < 0:15 at 90% condence level. We also nd evidence for signals in B+ ! K0K+ and B0 ! K0K0 with signicances of 3:0s and 3:5s , respectively. (Charge-conjugate modes included) The corresponding branching fractions are measured to be B(B+ !K0K+) = (1:0 0:40:1)10􀀀6 and B(B0 !K0K0 ) = (0:80:30:1)10􀀀6. No signal is observed in the decay B0!K+K􀀀 and we set an upper limit of 3:710􀀀7 at 90% condence level. These results are obtained from a data sample collected near the ¡(4S) resonance, with the Belle detector at the KEKB asymmetric energy e+e􀀀 collider.