Mechanisms of neutrinoless double-beta decay: A comparative analysis of several Nuclei

Abstract

The neutrinoless double beta decay of several nuclei that are of interest from the experimental point of view (76Ge, 82Se, 100Mo, 130Te, and 136Xe) is investigated on the basis of a general Lorentzinvariant effective Lagrangian describing physics effects beyond the Standard Model. The half-lives and angular-correlation coefficients for electrons are calculated for various decay mechanisms associated, in particular, with the exchange of Majorana neutrinos, supersymmetric particles (with R-parity violation), leptoquarks, and right-handed WR bosons. The effect of theoretical uncertainties in the values of relevant nuclear matrix elements on decay features is considered. © 2010 Pleiades Publishing, Ltd.