Neutron beta decay and the current determination of Vud

Details Neutron beta decay and the current determination of Vud Neutron beta decay and the current determination of Vud

2000-06-19

arxiv.org/abs/nucl-th/0006037v1

Phys.Lett.B500:66-74,2001

Physics

Nuclear Physics

Nuclear Theory

14 latex pages, 1 eps figure, submitted to Physics Letter B

Scientific paper

10.1016/S0370-2693(01)00051-X

Measurements of neutron beta decay observables required to determine $|V_{ud}|$ are reaching the 0.1% accuracy. In this paper 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 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 $|V_{ud}|$ 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.

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