Large muon $(g-2)$ from TeV-scale MSSM with infinite $\tan\beta$

TL;DR

This paper explores how the muon anomalous magnetic moment can be significantly affected in the MSSM when taking the infinite $ aneta$ limit, revealing new parameter regions where TeV-scale supersymmetric particles can explain experimental data.

Contribution

It demonstrates that in the infinite $ aneta$ limit of the MSSM, large corrections to $a_$ are possible, identifying specific parameter conditions that reconcile theory with experiment.

Findings

Large $a_$ corrections occur in the infinite $ aneta$ limit.

Parameter regions with either large Higgsino or muon sneutrino masses fit the experimental $a_$.

TeV-scale supersymmetric particles can account for the muon $g-2$ anomaly.

Abstract

The muon anomalous magnetic moment $a_\mu$ is studied in the infinite $\tan\beta$ limit of the MSSM. Since the muon mass arises completely from loop effects, large corrections to $a_\mu$ are expected in comparison to the usual case with moderately high $\tan\beta$. Due to the qualitatively different parameter dependence, the gap between the experimental value and the Standard Model prediction can be filled only in parameter volumes in which a mass hierarchy suppresses the chargino loop in favour of the neutralino contribution. Two such possibilities are found to have either large Higgsino mass or large muon sneutrino mass. Supersymmetric particles even at the TeV scale can lead to the best fit of $a_\mu$.