Neutrinoless double beta (0vββ) decay violates lepton number and is therefore a sensitive probe of physics beyond the standard model. Limits from 0vββ decay are usually expressed in terms of limits on the Majorana neutrino mass, the best experiment now giving (mv) ≤ 0.5 eV. However, in supersymmetric extensions of the SM there can be other sources of lepton number violation than the neutrino mass, the best-known example being RP-violation. 0vββ decay provides the most stringent limits on certain Rp MSSM parameters, ruling out first generation squarks as a possible explanation of the recent HERA high Q2-events. Furthermore, current low-energy constraints on and future collider phenomenology of (B - L) violating sneutrino masses are discussed. As has been proven recently such a (B - L) violating sneutrino mass is a necessary ingredient of any supersymmetric model with finite Majorana neutrino masses.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Nuclear and High Energy Physics