On the SUSY accompanied neutrino exchange mechanism of neutrinoless double beta decay

The neutrinoless double beta decay (0νββ) induced by light Majorana neutrino exchange between decaying nucleons, accompanied by the squark exchange inside one nucleon, recently discussed by Babu and Mohapatra, is carefully analyzed both from the particle and nuclear physics sides. New nuclear matrix elements relevant to this mechanism are calculated. We extend the analysis to include mixing of light neutrinos with heavy and “sterile” neutrinos. It introduces another supersymmtric (SUSY) contribution to 0νββ. We discuss constraints on the RpMSSM parameters imposed by the current experimental limit on 0νββ decay half-life of 76Ge.