Semileptonic hyperon decays and Cabibbo-Kobayashi-Maskawa unitarity

被引：56

作者：

Cabibbo, N

Swallow, EC

Winston, R

机构：

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

[2] Ist Nazl Fis Nucl, Sez Roma 1, I-00185 Rome, Italy

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

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

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

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 25期

关键词：

D O I：

10.1103/PhysRevLett.92.251803

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using a technique that is not subject to first-order SU(3) symmetry breaking effects, we determine the V-us element of the Cabibbo-Kobayashi-Maskawa matrix from data on semileptonic hyperon decays. We obtain V-us=0.2250(27), where the quoted uncertainty is purely experimental. This value is of similar experimental precision to the one derived from K-l3, but it is higher and thus in better agreement with the unitarity requirement, \V-ud\(2)+\V-us\(2)+\V-ub\(2)=1. An overall fit, including the axial contributions and neglecting SU(3) breaking corrections, yields F+D=1.2670 +/-0.0035 and F-D=-0.341+/-0.016 with chi(2)=2.96/3 degrees of freedom.

引用

页码：251803 / 1

页数：4

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