Semileptonic hyperon decays

被引：147

作者：

Cabibbo, N

Swallow, EC

Winston, R

机构：

[1] Univ Roma La Sapienza, Dept Phys, I-00185 Rome, Italy

[2] Elmhurst Coll, Dept Phys, Elmhurst, IL 60126 USA

[3] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[4] Univ Calif Merced, Div Nat Sci, Merced, CA 95344 USA

来源：

ANNUAL REVIEW OF NUCLEAR AND PARTICLE SCIENCE | 2003年 / 53卷

关键词：

beta decay; Cabibbo angle; CKM matrix; weak interaction; baryon;

D O I：

10.1146/annurev.nucl.53.013103.155258

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We review the status of hyperon semileptonic decays. The central issue is the V-us element of the CKM matrix, for which we obtain V-us = 0.2250(27). This value is similar in precision to the one derived from K-l3, but higher, and in better agreement with the unitarity requirement, \V-ud\(2) + \V-us\(2) + \V-ub\(2) = 1. We find that the Cabibbo model gives an excellent fit to baryon-beta-decay form-factor data (chi(2) = 2.96 for 3 degrees of freedom) with F + D = 1.2670 +/- 0.0030, F - D = -0.341 +/- 0.016, and no indication of flavor-SU(3)-breaking effects. We indicate the need for more experimental and theoretical work, both on hyperon beta decays and on K-l3 decays.

引用

页码：39 / 75

页数：37

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