Dispersive representation and shape of K_{l3} form factors

Details Dispersive representation and shape of K_{l3} form factors Dispersive representation and shape of K_{l3} form factors

2007-08-09

arxiv.org/abs/0708.1235v2

PoSKAON:012,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 4 figures. Discussion slightly extended in section 2. Talk given at the KAON07 International Conference, May 21-25 20

Scientific paper

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 K_{l3} form factors. We then discuss three applications to the analysis of K_{e3} and K_{mu3} measurements: the prediction of the ratios Gamma(K_{mu3})/Gamma(K_{e3}), the extraction of |f_+(0)V_{us}| and finally the possible measurement of m_u - m_d induced isospin breaking asymmetry.

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