Tree-level lepton universality violation in the presence of sterile neutrinos: impact for $R_K$ and $R_\pi$

A. Abada; D. Das; A. M. Teixeira; A. Vicente; C. Weiland

HAL: hal-00752375, version 1

arXiv: 1211.3052

DOI: 10.1007/JHEP02(2013)048

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Journal of High Energy Physics 1302 (2013) 048

Tree-level lepton universality violation in the presence of sterile neutrinos: impact for $R_K$ and $R_\pi$

A. Abada¹, D. Das¹, A. M. Teixeira², A. Vicente¹, C. Weiland¹

(2013)

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.

1:	LPT - Laboratoire de Physique Théorique d'Orsay

2:	LPC-CLERMONT - Laboratoire de Physique Corpusculaire de Clermont-Ferrand

Subject

Physics/High Energy Physics - Phenomenology

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http://fr.arXiv.org/abs/1211.3052


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From: Patricia Dubois-Violette <>
Submitted on: Thursday, 15 November 2012 15:29:29
Updated on: Tuesday, 12 February 2013 17:19:22