Flavour violation in charged leptons: Present and future

Asmâa Abada

doi:10.1016/j.crhy.2011.09.006

Flavour violation in charged leptons: Present and future
[Violation de la saveur dans le secteur des leptons chargés : Présent et futur]

Asmâa Abada ¹

¹ Laboratoire de Physique Théorique, CNRS – UMR 8627, Université de Paris-Sud 11, 91405 Orsay cedex, France

Comptes Rendus. Physique, Flavour physics and CP violation / Physique de la saveur et violation de CP, Volume 13 (2012) no. 2, pp. 180-185.

Résumé
Abstract

En lʼabsence de tout principe fondamental qui interdirait la non-conservation de la saveur dans le secteur des leptons chargés, on sʼattend que les extensions du Modèle Standard qui expliquent les masses et mélanges des neutrinos autorisent également la violation de la saveur à travers des processus tels que $ℓ_{i} \to ℓ_{j} γ$ , $ℓ_{i} \to ℓ_{j} ℓ_{k} ℓ_{m}$ et la conversion $μ – e$ dans les noyaux, dont les taux dépendent en général du mécanisme qui engendre des masses de neutrinos. On peut aussi rechercher des signes de cette violation directement aux collisionneurs, à travers des processus de production/désintégration de particules lourdes. Dʼune façon indépendante de tout modèle, nous montrons comment obtenir des informations sur la physique sous-jacente en utilisant des opérateurs effectifs. Enfin, nous considérons le rôle de la violation de la saveur leptonique dans des classes de modèles telles que la supersymétrie, les dimensions supplémentaires et les théories grand-unifiées.

In the absence of a fundamental principle preventing charged lepton flavour violation, one expects that extensions of the Standard Model accommodating neutrino masses and mixings should also allow for charged lepton flavour violating processes such as $ℓ_{i} \to ℓ_{j} γ$ , $ℓ_{i} \to ℓ_{j} ℓ_{k} ℓ_{m}$ and $μ – e$ conversion in nuclei, for which the rates depend in general on the mechanism of neutrino mass generation. In addition to low-energy experiments, there are also searches for lepton flavour violation at colliders, where new physics can be directly probed through flavour violating production and/or decays of heavy states. In a model independent way, we briefly use effective operators responsible for these processes to derive information about the underlying framework of new physics. We then consider some specific classes of models (supersymmetry, extra dimensions, grand unified theories) that account for rich scenarios of charged lepton flavour violation. We also comment on the rôle of charged lepton flavour violation in disentangling between models of new physics.

Publié le : 2012-01-04

DOI : 10.1016/j.crhy.2011.09.006

Keywords: Lepton flavour violation, Neutrino physics, Effective theories, New physics
Mots-clés : Violation de la saveur leptonique, Physique des neutrinos, Théories effectives, Nouvelle physique

Affiliations des auteurs :

Asmâa Abada ¹

¹ Laboratoire de Physique Théorique, CNRS – UMR 8627, Université de Paris-Sud 11, 91405 Orsay cedex, France

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     title = {Flavour violation in charged leptons: {Present} and future},
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Asmâa Abada. Flavour violation in charged leptons: Present and future. Comptes Rendus. Physique, Flavour physics and CP violation / Physique de la saveur et violation de CP, Volume 13 (2012) no. 2, pp. 180-185. doi : 10.1016/j.crhy.2011.09.006. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2011.09.006/

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