V_{us} from hyperon semileptonic decays

Details V_{us} from hyperon semileptonic decays V_{us} from hyperon semileptonic decays

2004-10-12

arxiv.org/abs/hep-ph/0410171v1

Phys.Rev. D70 (2004) 114036

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, Revtex4, 12 tables, no figures

Scientific paper

10.1103/PhysRevD.70.114036

A model-independent determination of the CKM matrix element V_{us} from five measured strangeness-changing hyperon semileptonic decays is performed. Flavor SU(3) symmetry breaking effects in the leading vector and axial-vector form factors are analyzed in the framework of the 1/N_c expansion of QCD. A fit to experimental data allows one to extract the value V_{us}=0.2199\pm 0.0026, which is comparable to the one from K_{e3} decays. This reconciliation is achieved through second-order symmetry breaking effects of a few percent in the form factors f_1, which increase their magnitudes over their SU(3) predictions.

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