V(us) Determination from Hyperon Semileptonic Decays

Details V(us) Determination from Hyperon Semileptonic Decays V(us) Determination from Hyperon Semileptonic Decays

2005-09-06

arxiv.org/abs/hep-ph/0509045v2

JHEP 0510 (2005) 041

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, no figures. References added and other minor changes

Scientific paper

10.1088/1126-6708/2005/10/041

We analyze the numerical determination of the quark mixing factor V(us) from hyperon semileptonic decays. The discrepancies between the results obtained in two previous studies are clarified. Our fits indicate sizeable SU(3) breaking corrections, which unfortunately can only be fully determined from the data at the first order. The lack of a reliable theoretical calculation of second-order symmetry breaking effects translates into a large systematic uncertainty, which has not been taken into account previously. Our final result, V(us) = 0.226 +/- 0.005, is not competitive with the existing determinations from K(l3), K(l2) and \tau decays.

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