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

The longstanding muon <math altimg="si1.svg"><mo stretchy="false">(</mo><mi>g</mi><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>2</mn><mo stretchy="false">)</mo></math> anomaly, as well as some 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 <math altimg="si1.svg"><mo stretchy="false">(</mo><mi>g</mi><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>2</mn><mo stretchy="false">)</mo></math> anomaly, which leads to an interesting LHC signal of <math altimg="si2.svg"><msup><mrow><mi>μ</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo></mrow></msup><msup><mrow><mi>τ</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">+</mo></mrow></msup><msup><mrow><mi>τ</mi></mrow><mrow><mo linebreak="badbreak" linebreakstyle="after">−</mo></mrow></msup></math> 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 <math altimg="si1.svg"><mo stretchy="false">(</mo><mi>g</mi><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>2</mn><mo stretchy="false">)</mo></math>-preferred parameter space, thus providing a robust, independent test of the muon <math altimg="si1.svg"><mo stretchy="false">(</mo><mi>g</mi><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>2</mn><mo stretchy="false">)</mo></math> anomaly.