Models of Dynamical R-Parity Violation

TL;DR

This paper develops a theoretical framework for dynamical R-parity violation in supersymmetry, highlighting the dominance of non-holomorphic operators and their implications for LHC searches and naturalness.

Contribution

It introduces models where R-parity violation is mediated by heavy messengers, emphasizing the role of non-holomorphic operators and proposing unified mediation scenarios.

Findings

R-parity violation is often dominated by non-holomorphic operators.

Effects of R-parity violation are naturally suppressed by mass ratios.

Unified mediation scenarios can incorporate R-parity, flavor, and supersymmetry breaking.

Abstract

The presence of R-parity violating interactions may relieve the tension between existing LHC constraints and natural supersymmetry. In this paper we lay down the theoretical framework and explore models of dynamical R-parity violation in which the breaking of R-parity is communicated to the visible sector by heavy messenger fields. We find that R-parity violation is often dominated by non-holomorphic operators that have so far been largely ignored, and might require a modification of the existing searches at the LHC. The dynamical origin implies that the effects of such operators are suppressed by the ratio of either the light fermion masses or the supersymmetry breaking scale to the mediation scale, thereby providing a natural explanation for the smallness of R-parity violation. We consider various scenarios, classified by whether R-parity violation, flavor breaking and/or supersymmetry breaking are mediated by the same messenger fields. The most compact case, corresponding to a deformation of the so called flavor mediation scenario, allows for the mediation of supersymmetry breaking, R-parity breaking, and flavor symmetry breaking in a unified manner.