Title：Neutrinoless double beta decay in the nuMSM

Speaker：Dr. Hiroyuki Ishida, KEK, Japan.

Time: October 27, 2019 ,15:00 PM

Venue：333 Lecture Hall, Physics Building

Abstract：The (neutrino minimal standard model) nuMSM is one of the most attractive and the simplest extension of the standard model by introducing three right-handed neutrinos with masses below the electroweak scale which is about 100 GeV. The model potentially has possibilities to explain the most mysterious problems of the standard model (SM) of the particle physics such as non-zero neutrino masses, the origin of the baryon asymmetry of the universe, and an existence of the dark matter candidate. In this talk, I briefly review the model and several interesting features. Interestingly, once one introduces right-handed neutrinos, Majorana neutrinos are predicted and such Majorana particles can be proved by neutrinoless double beta decay experiments. There is definite prediction of the effective mass of neutrinoless double beta decays within the SM with observed tiny neutrino masses framework and many experiments give constraints on the effective mass so far. I will explain that the model would have a possible enhancement of the effective mass from it of the SM due to contributions of right-handed neutrinos.