Dispersive representation and shape of K_{l3} form factors

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dc.creatorPassemar, Emilie
dc.date2007-08-09
dc.date2007-10-29
dc.date.accessioned2026-07-07T11:41:46Z
dc.date.available2026-07-07T11:41:46Z
dc.descriptionThe 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.
dc.description7 pages, 4 figures. Discussion slightly extended in section 2. Talk given at the KAON07 International Conference, May 21-25 2007, Frascati, Italy
dc.identifierhttps://arxiv.org/abs/0708.1235
dc.identifierhttp://arxiv.org/abs/0708.1235
dc.identifierPoSKAON:012,2008
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200655
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleDispersive representation and shape of K_{l3} form factors
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