Heinrich Päs

Neutrinoless double-beta decay and physics beyond the standard model

Neutrinoless double-beta decay is the most powerful tool to probe not only for Majorana neutrino masses but for lepton number violating physics in general. We discuss relations between lepton number violation, double-beta decay and neutrino mass, review a general Lorentz-invariant parametrization of the double-beta decay rate, highlight a number of different new physics models showing how different mechanisms can trigger double-beta decay and, finally, discuss possibilities of discriminating and testing these models and mechanisms in complementary experiments.

Probing the Majorana mass scale of right-handed neutrinos in mSUGRA

Abstract. We discuss the perspectives of testing the right-handed Majorana mass scale MR of the SUSY see-saw model in the mSUGRA framework. Lepton-flavor violating low energy processes are analyzed in recently proposed post-LEP benchmark scenarios, taking into account present uncertainties and future developments in the neutrino sector. Non-observation of

Neutrinoless Double Beta Decay

\mu \rightarrow e \gamma

Leptoquark patterns unifying neutrino masses, flavor anomalies, and the diphoton excess

in the next-generation PSI experiment will provide upper bounds on MR of the order of

Lepton masses and mixings in an

10^{12\div 14}

A_4

GeV, while on the other hand, a positive signal for

multi-Higgs model with a radiative seesaw mechanism

\tau \rightarrow \mu \gamma

Falsifying high-scale baryogenesis with neutrinoless double beta decay and lepton flavor violation

at SUPERKEKB or the LHC may determine MR for a given mSUGRA scenario with an accuracy of a factor of 2.

Exotic Higgs boson decay modes as a harbinger of

We review the potential to probe new physics with neutrinoless double beta decay

S_3

(A,Z) \to (A,Z+2) + 2 e^-