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V-us determination from hyperon semileptonic decays

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V-us determination from hyperon semileptonic decays

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Mateu Barreda, Vicent; Pich Zardoya, Antonio

Aquest document és un/a article, creat/da en: 2005

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, vertical bar V(us)vertical bar = 0.226 +/- 0.005, is not competitive with the existing determinations from K-l3, K-l2 and tau decays.

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