Multi-parameter approach to R-parity violating SUSY couplings

TL;DR

This paper develops a multi-parameter method to set bounds on R-parity violating SUSY couplings, allowing exploration of complex parameter spaces and revealing potential relaxations of previous bounds.

Contribution

It introduces an extended, multidimensional approach to constrain SUSY couplings, moving beyond single-coupling assumptions and enabling more comprehensive parameter space analysis.

Findings

Identifies regions where multiple couplings approach their bounds.

Shows that some bounds can be relaxed compared to previous single-coupling assumptions.

Provides order-of-magnitude estimates for conservative bounds.

Abstract

We introduce and implement a new, extended approach to placing bounds on trilinear R-parity violating couplings. We focus on a limited set of leptonic and semi-leptonic processes involving neutrinos, combining multidimensional plotting and cross-checking constraints from different experiments. This allows us to explore new regions of parameter space and to relax a number of bounds given in the literature. We look for qualitatively different results compared to those obtained previously using the assumption that a single coupling dominates the R-parity violating contributions to a process (SCD). By combining results from several experiments, we identify regions in parameter space where two or more parameters approach their maximally allowed values. In the same vein, we show a circumstance where consistency between independent bounds on the same combinations of trilinear coupling parameters implies mass constraints among slepton or squark masses. Though our new bounds are in most cases weaker than the SCD bounds, the largest deviations we find on individual parameters are factors of two, thus indicating that a conservative, order of magnitude bound on an individual coupling is reliably estimated by making the SCD assumption.