Multiple Mechanisms in 2β0ν-decay

The 2β0ν-decay can be induced by more than one lepton charge nonconserving mechanisms. We analyze some mechanisms contributing to the 2β0ν decay amplitude in the general case of CP nonconservation e.g. light Majorana neutrino exchange, heavy left-handed (LH) and right-handed (RH) Majorana neutrino exchanges, lepton charge non-conserving coupling in SUSY theories with Rp breaking. We show the results of the analysis for the cases of two “non-interfering” and two “interfering” mechanisms. We investigate the possibility to discriminate between different pairs of such mechanisms using data on 2β0ν-decay half-lives of nuclei with largely different nuclear matrix elements (NMEs). This allows, in principle, to draw conclusions about the pair of non-interfering (interfering) mechanisms possibly inducing the 2β0ν-decay from data on the half-lives.