We show that in the minimal supersymmetric standard model (MSSM), with R-parity breaking as well as in the left-right symmetric model, there are new observable contributions to neutrinoless double beta decay (ββ_0ν) arising from hitherto overlooked diagrams involving the exchange of one W boson and one scalar boson. In particular, in the case of MSSM, the present experimental bounds on ββ_0ν lifetime improves the limits on certain R-parity violating couplings by about 2 orders of magnitude. It is shown that similar diagrams also lead to enhanced rates for μ^-→e⁺ conversion in nuclei, which are in the range accessible to ongoing experiments.
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Babu et al. (1995) studied this question.
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