Dominance of Pion Exchange in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">R</mi></math></span>-Parity-Violating Supersymmetric Contributions to Neutrinoless Double Beta Decay

Amand Faessler; Sergey Kovalenko; Fedor Šimkovic; Joerg Schwieger

doi:10.1103/PhysRevLett.78.183

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

Amand Faessler, Sergey Kovalenko, Fedor Šimkovic, and Joerg Schwieger

Phys. Rev. Lett. 78, 183 – Published 13 January 1997

Abstract

We present a new contribution of the $R$ -parity-violating $(R_{p})$ supersymmetry (SUSY) to neutrinoless double beta decay $(0 ν β β)$ via the pion exchange between decaying neutrons. The pion coupling to the final state electrons is induced by the $R_{p}$ 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 $π$ meson. The constraints on the certain $R_{p}$ SUSY parameters are extracted from the current experimental $0 ν β β$ -decay half-life limit. These constraints are significantly stronger than those previously known or expected from the ongoing accelerator experiments.

Received 24 September 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.183

Authors & Affiliations

Amand Faessler¹, Sergey Kovalenko^1,2, Fedor Šimkovic^1,2,3, and Joerg Schwieger¹

¹Institut für Theoretische Physik der Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
²Joint Institute for Nuclear Research, 141980 Dubna, Russia
³Department of Nuclear Physics, Comenius University, Mlynská dolina F1, 84215 Bratislava, Slovakia