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14-16 mai 2012
Université Montpellier 2
Fuseau horaire Europe/Paris

Lepton flavour violation in the inverse seesaw

15 mai 2012 à 12:20
25m
Salle des actes, bât. 7 (UM2)

Salle des actes, bât. 7

UM2

Orateur

Cedric Weiland (LPT Orsay)

Description

The inverse seesaw is a very appealing mechanism to generate neutrino masses since it provides natural neutrino Yukawa couplings ($Y_\nu \sim O(1)$) and a seesaw scale close to the electroweak one, thus within LHC reach. In a previous work (arXiv:1111.5836) where we embedded the inverse seesaw in a supersymmetric extension of the Standard Model (MSSM), we have highlighted that the Higgs-mediated penguin diagrams contributing to lepton flavour violating observables like $\tau \rightarrow \mu \mu \mu$ or $B_{d}^{0} \rightarrow e \mu$ are enhanced by as much as two orders of magnitude. It has recently been pointed out (arXiv:1202.1825) that the Z-mediated contributions could be enhanced in extensions of the MSSM that accommodate neutrino masses, the supersymmetric inverse seesaw being one of them. This work is devoted to a comprehensive study of several LFV observables (mu-e conversion, \mu \rightarrow 3 e, \tau \rightarrow \mu \eta, etc) and their enhancements due to the effect of the inverse seesaw. It allows us to put new constraints on this model, given the present experimental bounds on these observables. Furthermore, LFV observables which are dominated by the Z- mediated contribution exhibit specific behaviour like a reduced dependence on the supersymmetric parameters or on the right-handed neutrino masses.

Auteur principal

Cedric Weiland (LPT Orsay)

Co-auteurs

Dr Avelino Vicente (LPT Orsay) Dr Debottam Das (Laboratoire de Physique Theorique d'Orsay) Dr asmaa Abada (LPT-Orsay-)

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