Résumé / Abstract Seminaire_IAP
« Neutrino Paradigm and LHC  »

Goran Senjanovic
High Energy Group, Abdus Salam International Centre Theoretical Physics (ICTP) (Trieste, Italie)

I argue that LHC may shed light on the nature of neutrino mass through the probe of the seesaw mechanism, whose main implication is that neutrino is a Majorana particle, i.e. its own antiparticle. The smoking gun signature is lepton number violation through the production of same sign lepton pairs, a collider analogy of the neutrinoless double beta decay. I discuss this in the context of the Left-Right symmetric theory, originally introduced to explain the origin of parity violation in weak interactions. This theory predicted neutrino mass long before experiment and led to the seesaw mechanism. The Right-Handed (RH) gauge boson with a mass in a few TeV region could easily dominate neutrinoless double beta decay, and its discovery at LHC would have spectacular signatures of parity restoration, lepton number violation and a unique, direct probe of the Majorana nature of RH neutrino.
Moreover, in a somewhat different parameter space of the theory, still at the LHC reach, the lightest RH neutrino can be a natural warm dark matter candidate.
vendredi 26 octobre 2012 - 11:00
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
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