Probing the muon (g-2) anomaly at the LHC in final states with two muons and two taus

TL;DR

This paper proposes a new supersymmetric model to explain the muon g-2 anomaly, predicts specific LHC signals, and demonstrates that future high-luminosity LHC runs can fully test this explanation.

Contribution

It introduces a novel RPV3 supersymmetric scenario linking muon g-2 and B-meson decay anomalies, with strategies to test it at the LHC.

Findings

Current LHC data constrains sneutrino mass and RPV couplings.

Dedicated selection strategies can improve bounds with existing data.

High-luminosity LHC can fully probe the muon g-2 favored parameter space.

Abstract

The longstanding muon $(g-2)$ anomaly, as well as the persistent hints of lepton flavor universality violation in $B$-meson decays, could be signaling new physics beyond the Standard Model (SM). A minimal $R$-parity-violating supersymmetric framework with light third-generation sfermions (dubbed as 'RPV3') provides a compelling solution to these flavor anomalies, while simultaneously addressing other pressing issues of the SM. We propose a new RPV3 scenario for the solution of the muon $(g-2)$ anomaly, which leads to an interesting LHC signal of $\mu^+\mu^-\tau^+\tau^-$ final state. We analyze the Run-2 LHC multilepton data to derive stringent constraints on the sneutrino mass and the relevant RPV coupling in this scenario. We then propose dedicated selection strategies to improve the bound even with the existing dataset. We also show that the high-luminosity LHC will completely cover the remaining muon $(g-2)$-preferred parameter space, thus providing a robust, independent test of the muon $(g-2)$ anomaly.