Neutron beta decay and the current determination of Vud

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dc.creatorGarcia, A.
dc.creatorGarcia-Luna, J. L.
dc.creatorCastro, G. Lopez
dc.date2000-06-19
dc.date.accessioned2026-07-07T13:13:12Z
dc.date.available2026-07-07T13:13:12Z
dc.descriptionMeasurements 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 $λ$, 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 $|V_{ud}|$--$λ$ plane where new physics effects should lie, if they contribute to neutron beta decay.
dc.description14 latex pages, 1 eps figure, submitted to Physics Letter B
dc.identifierhttps://arxiv.org/abs/nucl-th/0006037
dc.identifierhttp://arxiv.org/abs/nucl-th/0006037
dc.identifierPhys.Lett.B500:66-74,2001
dc.identifierdoi:10.1016/S0370-2693(01)00051-X
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/229814
dc.subjectNuclear Theory
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Experiment
dc.titleNeutron beta decay and the current determination of Vud
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