Neutron beta decay and the current determination of Vud

被引：16

作者：

García, A ^{[1
]}

García-Luna, JL ^{[1
]}

Castro, GL ^{[1
]}

机构：

[1] Inst Politecn Nacl, Ctr Invest & Estudios Avanzados, Dept Fis, Mexico City 07000, DF, Mexico

来源：

PHYSICS LETTERS B | 2001年 / 500卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(01)00051-X

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Measurements of neutron beta decay observables required to determine /V-ud/ are reaching the 0.1% accuracy. In this Letter we review the calculation of the decay rate of this process, discuss its relevant uncertainties, and obtain an expression that is precise at the 10(-4) level. Our analysis clearly shows the necessity of more precise measurements of lambda, the ratio of axial/vector couplings. The current situation in neutron beta decay is that one cannot yet quote a single consistent value for IV,dl from it. We also discuss the region of parameter space in the /V-ud/-lambda plane where new physics effects: should lie, if they contribute to neutron beta decay. (C) 2001 Published by Elsevier Science B.V.

引用

页码：66 / 74

页数：9

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