Direct CP Violation and Isospin Triangles of B-pipi Decays.pdf

下载文档

2
0
约1.72万字
约 9页
2017-04-13 发布于江苏
举报
版权申诉
保障服务

Direct CP Violation and Isospin Triangles of B-pipi Decays.pdf

1、本文档共9页，可阅读全部内容。
2、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。
3、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。

Direct CP Violation and Isospin Triangles of B-pipi Decays

a r X i v : h e p - p h / 0 3 0 8 2 2 5 v 2 1 6 S e p 2 0 0 3 Direct CP Violation and Isospin Triangles of B → ππ Decays Zhi-zhong Xing CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, China and Institute of High Energy Physics, Chinese Academy of Sciences, P.O. Box 918 (4), Beijing 100039, China ? (Electronic address: xingzz@mail.ihep.ac.cn) Abstract The recent observation of B0d → π0π0 and B?0d → π0π0 decay modes allows us to make a fresh isospin analysis of B → ππ transitions. We find that current experimental data can impose some model-independent constraints on the parameter space of direct CP violation in Bd → π+π? and Bd → π0π0. Furthermore, we establish a direct relationship between the weak phase α and the charge-averaged branching fractions and CP-violating asymmetries of B → ππ decays. PACS number(s): 12.15.Ff, 13.25.Hw, 11.30.Er, 14.40.Nd Typeset using REVTEX ?Mailing address 1 The major goal of B-meson factories is to test the Kobayashi-Maskawa mechanism of CP violation within the standard model and to detect possible new sources of CP violation beyond the standard model. So far the CP-violating asymmetry in B0d vs B? 0 d → J/ψKS decays has unambiguously been measured at KEK and SLAC [1], and the experimental result is compatible very well with the standard-model expectation. Some preliminary evidence for CP violation in a number of other B decays has also been reported by BaBar and Belle Collaborations [2]. Further experiments will provide much more precise data on CP violation in the B-meson system, from which one may cross-check the consistency of the Kobayashi-Maskawa picture and probe possible new physics. The charmless two-body nonleptonic decays B?0d → π+π?, B?0d → π0π0 and B?u → π0π?, which can be related to one another via the isospin triangle [3], have been of great in- terest in B physics for a stringent test of the factorization hypothesis, a quantitative analysis of final-state interactions, and a clean determination of the CP-