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Conference Papers Year : 2007

Dispersive representation and shape of $K_{\ell3}$ 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 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.

Dates and versions

in2p3-00166865 , version 1 (10-08-2007)

Identifiers

  • HAL Id : in2p3-00166865 , version 1
  • ARXIV : 0708.1235

Cite

E. Passemar. Dispersive representation and shape of $K_{\ell3}$ form factors. Kaon International Conference, May 2007, Frascati, Italy. ⟨in2p3-00166865⟩
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