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| HAL : hal-00752375, version 1 |
| arXiv : 1211.3052 |
| DOI : 10.1007/JHEP02(2013)048 |
| Fiche détaillée |  Récupérer au format |
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| Journal of High Energy Physics 1302 (2013) 048 |
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| Tree-level lepton universality violation in the presence of sterile neutrinos: impact for $R_K$ and $R_\pi$ |
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| A. Abada 1D. Das 1 |
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| (2013) |
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| We consider a tree-level enhancement to the violation of lepton flavour universality in light meson decays arising from modified $W \ell \nu$ couplings in the standard model minimally extended by sterile neutrinos. Due to the presence of additional mixings between the active (left-handed) neutrinos and the new sterile states, the deviation from unitarity of the leptonic mixing matrix intervening in charged currents might lead to a tree-level enhancement of $R_{P} = \Gamma (P \to e \nu) / \Gamma (P \to \mu \nu)$, with $P=K, \pi$. We illustrate these enhancements in the case of the inverse seesaw model, showing that one can saturate the current experimental bounds on $\Delta r_{K}$ (and $\Delta r_{\pi}$), while in agreement with the different experimental and observational constraints. |
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| 1 : | Laboratoire de Physique Théorique d'Orsay (LPT) |
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CNRS : UMR8627 – Université Paris XI - Paris Sud |
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| 2 : | Laboratoire de Physique Corpusculaire de Clermont-Ferrand (LPC-CLERMONT) |
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CNRS : UMR6533 – IN2P3 – Université Blaise Pascal - Clermont-Ferrand II |
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| Domaine | : | Physique/Physique des Hautes Energies - Phénoménologie |
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| Lien vers le texte intégral : |
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| http://fr.arXiv.org/abs/1211.3052 |
| hal-00752375, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00752375 | |
| oai:hal.archives-ouvertes.fr:hal-00752375 | |
| Contributeur : Patricia Dubois-Violette | |
| Soumis le : Jeudi 15 Novembre 2012, 15:29:29 | |
| Dernière modification le : Mardi 12 Février 2013, 17:19:22 | |
