New vector-scalar contributions to neutrinoless double beta decay and constraints on R-parity violation

Abstract

We show that in 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 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 neutrinoless double beta decay lifetime improves the limits on certain R-parity violating couplings by about two orders of magnitude. It is shown that similar diagrams also lead to enhanced rates for ${\mu }^{-}\to e^{+}$ conversion in nuclei, which are in the range accessible to ongoing experiments.

Latex file; 9 pages; 3 figures available on request

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