Higgs masses and Electroweak Precision Observables in the Lepton-Flavor-Violating MSSM

TL;DR

This paper investigates how lepton flavor violation in the MSSM affects Higgs mass predictions and electroweak precision observables, providing constraints and computational tools for future research.

Contribution

It introduces a model-independent parameterization of slepton mixing and assesses its impact on key observables, with publicly available computational implementations.

Findings

LFV parameters significantly influence Higgs and electroweak observables.

Constraints from LFV decays and precision measurements are comparable.

New computational tools for analyzing LFV effects are provided.

Abstract

We study the effects of Lepton Flavor Violation (LFV) in the scalar lepton sector of the MSSM on precision observables such as the W-boson mass and the effective weak leptonic mixing angle, and on the Higgs-boson mass predictions. The slepton mass matrices are parameterized in a model-independent way by a complete set of dimensionless parameters which we constrain through LFV decay processes and the precision observables. We find regions where both conditions are similarly constraining. The necessary prerequisites for the calculation have been added to FeynArts and FormCalc and are thus publicly available for further studies. The obtained results are available in FeynHiggs.