Dispersive representation and shape of Kl3 form factors
Abstract
The Callan-Treiman low-energy theorem offers an opportunity to test electroweak couplings of light quarks to the gauge boson W. To that aim, we introduce a model-independent and accurate dispersive parametrization of the two Kl3 form factors. We then discuss three applications to the analysis of Ke3 and Kmu3 measurements: the prediction of the ratios Gamma(Kmu3)/Gamma(Ke3), the extraction of |f+(0)Vus| and finally the possible measurement of mu - md induced isospin breaking asymmetry.
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