Is the Unitarity of the quark-mixing-CKM-matrix violated in neutron $β$-decay?

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dc.creatorAbele, H.
dc.creatorHoffmann, M. Astruc
dc.creatorBaessler, S.
dc.creatorDubbers, D.
dc.creatorGlück, F.
dc.creatorMüller, U.
dc.creatorNesvizhevsky, V.
dc.creatorReich, J.
dc.creatorZimmer, O.
dc.date2002-06-23
dc.date.accessioned2026-07-07T10:32:11Z
dc.date.available2026-07-07T10:32:11Z
dc.descriptionWe report on a new measurement of neutron $β$-decay asymmetry. From the result \linebreak $A_0$ = -0.1189(7), we derive the ratio of the axial vector to the vector coupling constant $λ$ = ${\it g_A/g_V}$ = -1.2739(19). When included in the world average for the neutron lifetime $τ$ = 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 $Δ$ = 0.0083(28), which is 3.0 times the stated error.
dc.identifierhttps://arxiv.org/abs/hep-ex/0206058
dc.identifierhttp://arxiv.org/abs/hep-ex/0206058
dc.identifierPhys.Rev.Lett.88:211801,2002
dc.identifierdoi:10.1103/PhysRevLett.88.211801
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178670
dc.subjectHigh Energy Physics - Experiment
dc.titleIs the Unitarity of the quark-mixing-CKM-matrix violated in neutron $β$-decay?
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