Chair: M. Hirsch
Renato Fonseca (IFIC, CSIC - Univ Valencia)
If neutrinos are Majorana particles, lepton number is not conserved in Nature and double beta decay without the emission of neutrinos should occur. The dominant contribution to this process might be mediated by new TeV-scale particles instead of the light neutrinos. It turns out that in models with extended gauge groups, some of these mediators might be the extra gauge bosons themselves. In...
Marcela Gonzalez (UTFSM)
The decay rate of neutrinoless double beta (0νββ) decay contains terms from heavy particle exchange, which lead to dimension-9 (d = 9) six fermion operators at low energies. Limits on the coefficients of these operators have been derived previously neglecting the running of the operators between the high-scale, where they are generated, and the energy scale of double beta decay, where they are...
Frank Deppisch (Univ College London)
Interactions that manifest themselves as lepton number violating (LNV) processes in combination with sphaleron transitions typically erase any pre-existing baryon asymmetry of the Universe. We demonstrate in a model-independent approach that the observation of LNV processes would impose a stringent constraint on mechanisms of high-scale baryogenesis, including leptogenesis scenarios....
Stéphane Lavignac (IPhT)
We will discuss the possibility of sterile neutrinos arising as supersymmetric partners of pseudo-Goldstone bosons of a spontaneously broken global symmetry. We will consider both the case of an eV-scale sterile neutrino that could be relevant for the experimental anomalies or for future searches for sterile neutrinos, and the case of a neutrino in the 1 GeV -1 TeV mass range that could be...