Semileptonic Hyperon Decays

Details Semileptonic Hyperon Decays Semileptonic Hyperon Decays

2003-07-23

arxiv.org/abs/hep-ph/0307298v1

Ann.Rev.Nucl.Part.Sci.53:39-75,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

37 pages, 8 figures, 4 tables, Final version of this material is scheduled to appear in the Annual Review of Nuclear and Parti

Scientific paper

10.1146/annurev.nucl.53.013103.1

We review the status of hyperon semileptonic decays. The central issue is the $V_{us}$ element of the CKM matrix, where we obtain $V_{us}=0.2250 (27)$. This value is of similar precision, but higher, than the one derived from $K_{l3}$, and in better agreement with the unitarity requirement, $|V_{ud}|^2+|V_{us}|^2+|V_{ub}|^2=1$. We find that the Cabibbo model gives an excellent fit of the existing form factor data on baryon beta decays ($\chi^{2} = 2.96$ for 3 degrees of freedom) with $F + D = 1.2670 \pm 0.0030$, $F - D = -0.341 \pm 0.016$, and no indication of flavour-SU(3)-breaking effects. We indicate the need of more experimental and theoretical work, both on hyperon beta decays and on $K_{l3}$ decays.

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