Is the unitarity of the quark-mixing CKM matrix violated in neutron β-decay? -: art. no. 211801

被引：144

作者：

Abele, H

Hoffmann, MA

Baessler, S

Dubbers, D

Glück, F

Müller, U

Nesvizhevsky, V

Reich, J

Zimmer, O

机构：

[1] Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[3] KFKI RMKI, H-1525 Budapest, Hungary

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.88.211801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on a new measurement of neutron beta-decay asymmetry. From the result A(0) = -0.1189(7) , we derive the ratio of the axial vector to the vector coupling constant lambda=g(A)/g(V)=-1.2739(19) . When included in the world average for the neutron lifetime tau=885.7(7) s , this gives the first element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix V-ud . With this value and the Particle Data Group values for V-us and V-ub , we find a deviation from the unitarity condition for the first row of the CKM matrix of Delta=0.0083(28) , which is 3.0 times the stated error.

引用

页数：4

共 33 条

[1] A measurement of the beta asymmetry A in the decay of free neutrons [J].