Semileptonic Hyperon Decays and CKM Unitarity

Abstract

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, $|V_{ud}{|}^2+|V_{us}{|}^2+|V_{ub}{|}^2=1$.

3 pages, 1 table

References in corpus (4)

• Semileptonic Hyperon Decays
• Measurements of Direct CP Violation, CPT Symmetry, and Other Parameters in the Neutral Kaon System
• New, high statistics measurement of the K+ -> pi0 e+ nu (Ke3) branching ratio
• Measurement of the CKM Matrix Element |Vub| with B->rho e nu Decays

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