Neutrinoless Double Beta Decay via Light Neutralinos in R-Parity Violating Supersymmetry

TL;DR

This paper investigates how light neutralinos in R-parity violating supersymmetry could mediate neutrinoless double beta decay, providing new constraints on supersymmetric parameters by analyzing nuclear matrix elements and comparing with experimental bounds.

Contribution

It introduces a comprehensive analysis of neutrinoless double beta decay mediated by neutralinos of arbitrary mass within R-parity violating MSSM, including an interpolation of decay behaviors and updated constraints.

Findings

Constraints on supersymmetry parameters from non-observation of $0 uetaeta$ decay.

Comparison of these constraints with collider, pion decay, CKM unitarity, and Big Bang Nucleosynthesis bounds.

Use of Interacting Boson Model for nuclear matrix element calculations.

Abstract

We perform a study of neutrinoless double beta ($0\nu\beta\beta$) decay mediated by the lightest neutralino of arbitrary mass in the Minimal Supersymmetric Standard Model (MSSM) under the presence of R-parity violating trilinear interactions. In this scenario, the exchange of the lightest neutralino can result in $0\nu\beta\beta$ decay of either long-range or short-range behaviour, depending on the neutralino mass. Using nuclear matrix elements calculated in the Interacting Boson Model, we use an interpolation between the long- and short-range behaviours with an approximate formula. The non-observation of $0\nu\beta\beta$ decay is then used to place constraints on the supersymmetry parameter space, compatible with constraints from collider experiments. We compare these constraints to bounds from pion decays, CKM unitarity and Big Bang Nucleosynthesis.