SEMILEPTONIC HYPERON DECAYS

By N. Cabibbo, E. Swallow, R. Winston. 2003

146 citations recorded by the source corpus.

▪ Abstract We review the status of hyperon semileptonic decays. The central issue is the Vus element of the CKM matrix, for which we obtain Vus = 0.2250 (27). This value is similar in precision to the one derived from Kl3, but higher, and in better agreement with the unitarity requirement, |Vud|2 + |us|2 + |Vub|2 = 1. We find that the Cabibbo model gives an excellent fit to baryon–beta-decay form-factor data (χ2 = 2.96 for 3 degrees of freedom) with F + D = 1.2670 ± 0.0030, F − D = −0.341 ± 0.016, and no indication of flavor-SU(3)–breaking effects. We indicate the need for more experimental and theoretical work, both on hyperon beta decays and on Kl3 decays.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b4aaa0abd7a897fe718caaa66d7251a8e05d1040

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Citations in the corpus

• Proton stability in grand unified theories, in strings and in branes (2006, background): “Numerically f =139 MeV, while F and D can be obtained from a recent analysis of hyperon decays which gives [470] F + D = 1.”
• Beta Decays and Non-Standard Interactions in the LHC Era (2013, background): “In this case the matrix elements of the axial current must be determined experimentally [108, 109].”