| Domaine : |
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Physique/Physique des Hautes Energies - Phénoménologie
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| Titre : |
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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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| Auteur(s) : |
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A. Abada1, D. Das1, A. M. Teixeira2, A. Vicente1, C. Weiland1 |
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| Laboratoire : |
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| Résumé : |
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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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Langue du texte
intégral : |
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Anglais |
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Date de production,
écriture : |
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13/11/2012 |
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| Journal : |
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| Journal of High Energy Physics |
| Publisher |
Institute of Physics (IOP) |
| ISSN |
1126-6708 (eISSN : 1029-8479) |
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| Audience : |
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internationale |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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| Date de publication : |
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2013 |
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| Volume : |
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1302 |
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| Page, identifiant, ... : |
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048 |
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| Commentaire : |
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9 pages, 2 eps figures |
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| Référence interne : |
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LPT-ORSAY 12-109 ; PCCF RI 12-07 |
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