125 GeV Higgs boson decay to a pair of muons in the $\mu\nu$SSM

TL;DR

This paper studies the decay of the 125 GeV Higgs boson into muons within the $mbda$SSM model, showing potential enhancements over the Standard Model prediction at one-loop level, consistent with experimental data.

Contribution

It provides the first detailed one-loop level analysis of $h\rightarrow \mu\bar{\mu}$ decay in the $mbda$SSM, highlighting possible deviations from the SM.

Findings

Decay width can be increased by about 10% compared to SM.

Results are consistent with current experimental measurements.

The model explains muon magnetic moment constraints.

Abstract

Recently, the ATLAS and CMS Collaborations measured the 125 GeV Higgs boson decay to a pair of muons $h\rightarrow \mu \bar{\mu}$, which reported the signal strength relative to the standard model (SM) prediction is $1.2\pm0.6$ and $1.19^{+0.40+0.15}_{-0.39-0.14}$, respectively. In this work, we investigate the 125 GeV Higgs boson decay $h\rightarrow \mu \bar{\mu}$ at one-loop level in the $\mu$ from $\nu$ Supersymmetric Standard Model ($\mu\nu$SSM). Compared to the SM prediction, the decay width of $h\rightarrow \mu \bar{\mu}$ in the $\mu\nu$SSM can boost up about 10\%, considering the constraint from the muon anomalous magnetic dipole moment.