Misc,

Dispersive representation of the scalar and vector Kpi form factors for tau &\#45;&\#45;> K pi nu\_tau and K\_l3 decays

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(Mar 24, 2011)

Abstract

Recently, the tau --> K pi nu\_tau decay spectrum has been measured by the Belle and BaBar collaborations. In this work, we present an analysis of such decays introducing a dispersive parametrization for the vector and scalar Kpi form factors. This allows for precise tests of the Standard Model. For instance, the determination of f\_+(0)|V\_us| from these decays is discussed. A comparison and a combination of these results with the analyses of the K\_l3 decays is also considered.

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