SUSY dark matter and lepton flavor violation

TL;DR

This paper investigates lepton flavor violation in supersymmetric models with a focus on how neutrino sector parameters influence dark matter relic density, revealing that LFV rates can be significantly higher than previously estimated and are not excluded by current experimental limits.

Contribution

It provides a detailed analysis of LFV processes in SUSY seesaw models, considering various neutrino Yukawa matrices and highlighting the impact on dark matter and LFV predictions.

Findings

LFV rates can differ by up to two orders of magnitude from naive estimates.

Current LFV limits do not exclude large neutrino Yukawa couplings.

The ISAJET-M program was developed for these computations.

Abstract

We study lepton flavor-violating (LFV) processes within a supersymmetric type-I seesaw framework with flavor-blind universal boundary conditions, properly accounting for the effect of the neutrino sector on the dark matter relic abundance. We consider several possibilities for the neutrino Yukawa coupling matrix and show that in regions of SUSY parameter space that yield the correct neutralino relic density, LFV rates can differ from naive estimates by up to two orders of magnitude. Contrary to common belief, we find that current LFV limits do not exclude neutrino Yukawa couplings larger than top Yukawa couplings. We introduce the ISAJET-M program that was used for the computations.