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Standard model and new physics contributions to K L and K S into four leptons

  • Giancarlo D’Ambrosio
  • David Greynat
  • Grégory Vulvert
Regular Article - Theoretical Physics

Abstract

We study the K L and K S decays into four leptons (\(e\bar{e}e\bar{e}\), \(\mu\bar{\mu}\mu\bar{\mu}\), \(e\bar{e}\mu\bar{\mu}\)) where we use a form factor motivated by vector meson dominance, and show the dependence of the branching ratios and spectra from the slopes. A precise determination of short-distance contribution to K L μμ is affected by our ignorance on the sign of the amplitude \(\mathcal{A}(K_{L}\to\gamma\gamma)\) but we show a possibility to measure the sign of this amplitude by studying K L and K S decays in four leptons. We also investigate the effect of New Physics contributions for these decays.

Keywords

Form Factor Chiral Perturbation Theory Electromagnetic Form Factor Vector Meson Dominance Vector Meson Dominance Model 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors would like to thank F. Ambrosino, O. Cata, P. Massarotti, J. Portolés for his careful reading of the manuscript, E. de Rafael and M.D. Sokoloff. G.D. acknowledges partial support by MIUR under project 2010YJ2NYW (SIMAMI). D.G.’s work is supported in part by the EU under Contract MTRN-CT-2006-035482 (FLAVIAnet) and by MUIR, Italy, under Project 2005-023102. G.V.’s research has been supported in part by the Spanish Government and ERDF funds from the EU Commission [grants FPA2007-60323, CSD2007-00042 (Consolider Project CPAN)].

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Copyright information

© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica 2013

Authors and Affiliations

  • Giancarlo D’Ambrosio
    • 1
  • David Greynat
    • 1
    • 2
  • Grégory Vulvert
    • 3
  1. 1.INFN-Sezione di NapoliNapoliItaly
  2. 2.Dipartimento di Scienze FisicheUniversitá di Napoli Federico IINapoliItaly
  3. 3.Departament de Física Teòrica, IFICUniversitat de València—CSICValènciaSpain

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