Semileptonic Hyperon Decays and CKM Unitarity

Details Semileptonic Hyperon Decays and CKM Unitarity Semileptonic Hyperon Decays and CKM Unitarity

2003-07-16

arxiv.org/abs/hep-ph/0307214v2

Phys.Rev.Lett. 92 (2004) 251803

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 1 table

Scientific paper

10.1103/PhysRevLett.92.251803

Using a technique that is not subject to first-order SU(3) symmetry breaking
effects, we determine the $V_{us}$ element of the CKM matrix from data on
semileptonic hyperon decays. We obtain $V_{us}$ =0.2250(27). This value is of
similar precision to the one derived from $K_{l3}$, but higher and in better
agreement with the unitarity requirement, $|V_{ud}|^2+|V_{us}|^2+|V_{ub}|^2=1$.

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