Lepton flavor violating Higgs boson decays in the MSSM-seesaw

TL;DR

This paper investigates lepton flavor violating decays of the Higgs boson within an extended MSSM framework, calculating decay rates and exploring parameter spaces consistent with neutrino data and lepton flavor violation constraints.

Contribution

It provides the first detailed computation of LFV Higgs decay widths in the MSSM-seesaw model, including numerical analysis of branching ratios and their maximum predicted values.

Findings

LFV Higgs decay ratios can reach up to 10^{-5}.

Branching ratios depend on MSSM and seesaw parameters.

Compatibility with neutrino and lepton decay data constrains the parameter space.

Abstract

Lepton flavor violating Higgs boson decays (LFVHD) are studied in the context of the Minimal Supersymmetric Standard Model (MSSM) enlarged with three right handed neutrinos and their supersymmetric partners, and with the neutrino masses being generated by the seesaw mechanism. We compute the partial widths for these decays to one-loop order and analyze numerically the corresponding branching ratios in terms of the MSSM and seesaw parameters. We analyze in parallel the lepton flavor changing $\l_j\to l_i \gamma$ decays and explore the maximum predicted rates for LFVHD, mainly for $H^0,A^0 \to \tau {\bar \mu}$ decays, by requiring compatibility with neutrino and $BR(\l_j\to l_i \gamma)$ data. We find LFVHD ratios of up to $10^{-5}$ in some regions of the MSSM-seesaw parameter space.