\mu to e in R-symmetric Supersymmetry

TL;DR

This paper shows that mu/e slepton mixing in R-symmetric supersymmetry is more constrained than previously thought, with mu to e conversion providing the strongest bounds, affecting future experimental searches.

Contribution

It provides a detailed analysis of flavor violation bounds in R-symmetric supersymmetry, highlighting the importance of mu to e conversion and refining the allowed parameter space.

Findings

Maximal mixing is rarely possible with weak scale superpartners.

O(0.1) mixing is permitted in most of the parameter space.

Mu to e conversion imposes stronger constraints than mu to e gamma.

Abstract

We demonstrate that mu/e slepton mixing is significantly more restricted than previously thought within the already remarkably flavor-safe R-symmetric supersymmetric standard model. We calculate bounds from mu to e gamma, mu to 3e and, most importantly, mu to e conversion. The process mu to e conversion is significantly more restrictive in R-symmetric models since this process can occur through operators that do not require a chirality-flip. We delineate the allowed parameter space, demonstrating that maximal mixing is rarely possible with weak scale superpartners, while O(0.1) mixing is permitted within most of the space. The best approach to find or rule out mu/e mixing in R-symmetric supersymmetric models is a multi-pronged attack looking at both mu to e conversion as well as mu to e gamma. The redundancy eliminates much of the parameter space where one process, but not both processes, contain amplitudes that accidentally destructively interfere. We briefly discuss implications for searches of slepton flavor violation at the LHC.