Supersymmetric Interpretation of the Muon $g-2$ Anomaly

TL;DR

This paper explores supersymmetric models to explain the muon g-2 anomaly, analyzing collider constraints and dark matter implications, and identifies viable parameter regions for different supersymmetry scenarios.

Contribution

It provides a detailed analysis of low-scale supersymmetric models addressing the muon g-2 anomaly, considering collider searches and dark matter constraints, highlighting viable parameter spaces.

Findings

Certain supersymmetric parameter regions remain viable for explaining g-2.

Low mass sleptons around 230 GeV can account for the anomaly.

Bino-dominated scenarios with heavy higgsinos are favored at low tan beta.

Abstract

The Fermilab Muon $g-2$ collaboration recently announced the first result of measurement of the muon anomalous magnetic moment ($g-2$), which confirmed the previous result at the Brookhaven National Laboratory and thus the discrepancy with its Standard Model prediction. We revisit low-scale supersymmetric models that are naturally capable to solve the muon $g-2$ anomaly, focusing on two distinct scenarios: chargino-contribution dominated and pure-bino-contribution dominated scenarios. It is shown that the slepton pair-production searches have excluded broad parameter spaces for both two scenarios, but they are not closed yet. For the chargino-dominated scenario, the models with $m_{\tilde{\mu}_{\rm L}}\gtrsim m_{\tilde{\chi}^{\pm}_1}$ are still widely allowed. For the bino-dominated scenario, we find that, although slightly non-trivial, the region with low $\tan \beta$ with heavy higgsinos is preferred. In the case of universal slepton masses, the low mass regions with $m_{\tilde{\mu}}\lesssim 230$ GeV can explain the $g-2$ anomaly while satisfying the LHC constraints. Furthermore, we checked that the stau-bino coannihilation works properly to realize the bino thermal relic dark matter. We also investigate heavy staus case for the bino-dominated scenario, where the parameter region that can explain the muon $g-2$ anomaly is stretched to $m_{\tilde{\mu}}\lesssim 1.3$ TeV.