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arXiv 0712.0734hep-ex
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标准模型在轻子和半轻子K介子衰变中的精度检验

Precision tests of Standard Model with leptonic and semileptonic kaon decays

Mario Antonelli

摘要:

直到2004年中期,幺正关系Vud ^2 + Vus ^2 + Vub ^2 =1似乎在2.3 sigma水平上不成立。然而,当时Vus是从旧的实验数据推断出来的。从那时起,大量的实验和理论的努力已经投入到消除的问题。由于BNL-E865、KLOE、KTeV、ISTRA+和NA 48的新的和改进的测量,Kl 3的衰变率上升,使得Vus现在与幺正性一致。在理论方面,已经取得了很大的进展,以驯服与Kl 3形状因子的计算相关的系统不确定性。这一联合进展允许在低于1%的水平上评估CKM酉性关系的有效性。总结了最近的测量有助于Vus,Vus/Vud的确定的K介子衰变,和Vusf 0和Vus的最新评估。此外,我们还讨论了Kl 3和Kl 2衰变对标准模型以外的各种物理情况的敏感性。

英文摘要:

Till the middle of 2004 it appeared that the unitarity relation Vud^2+Vus^2+Vub^2=1 might not hold at the 2.3sigma level. At that time, however, Vus was inferred from old experimental data. Since then, a large experimental and theoretical effort has been invested leading to a removal of the problem. Thanks to the new and improved measurements by BNL-E865, KLOE, KTeV, ISTRA+ and NA48, the Kl3 decay rate moved up so that Vus is now consistent with unitarity. On the theory side, much progress has been made in order to tame the systematic uncertainties related to the computation of the Kl3 form factors. This joint progress allowed to assess the validity of the CKM unitarity relation at the level of less than $1%. Recent measurements of kaon decays contributing to the determination of Vus, Vus/Vud are summarized, and up-to-date evaluations of Vusf0 and Vus are presented. In addition, we discuss the sensitivity of Kl3 and Kl2 decays to various scenarios of physics beyond Standard Model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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