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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.
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http://hal.in2p3.fr/in2p3-00166865
Contributor : Dominique Girod <>
Submitted on : Friday, August 10, 2007 - 3:49:33 PM
Last modification on : Wednesday, September 16, 2020 - 4:08:18 PM

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

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

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