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Dominance of Pion Exchange in R -Parity-Violating Supersymmetric Contributions to Neutrinoless Double Beta Decay

1997; American Physical Society; Volume: 78; Issue: 2 Linguagem: Inglês

10.1103/physrevlett.78.183

1092-0145

Amand Faessler, Sergey Kovalenko, F. Šimkovic, Joerg Schwieger,

Dark Matter and Cosmic Phenomena

We present a new contribution of the R-parity violating supersymmetry (SUSY) to neutrinoless double beta decay via the pion exchange between decaying neutrons. The pion coupling to the final state electrons is induced by the R-parity violating SUSY interactions. We have found this pion-exchange mechanism to dominate over the conventional two-nucleon one. The latter corresponds to direct interaction between quarks from two decaying neutrons without any light hadronic mediator like pion. The constraints on the certain R-parity violating SUSY parameters are extracted from the current experimental neutrinoless double beta decay half-life limit. These constraints are significantly stronger than those previously known or expected from the ongoing accelerator experiments.