Supersymmetric interpretation of the muon g – 2 anomaly
Motoi Endo, Koichi Hamaguchi, Sho Iwamoto, Teppei Kitahara
Abstract
A bstract 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 $$ {m}_{{\tilde{\mu}}_{\mathrm{L}}}\gtrsim {m}_{{\tilde{\chi}}_1^{\pm }} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>m</mml:mi><mml:msub><mml:mover><mml:mi>μ</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mi>L</mml:mi></mml:msub></mml:msub><mml:mo>≳</mml:mo><mml:msub><mml:mi>m</mml:mi><mml:msubsup><mml:mover><mml:mi>χ</mml:mi><mml:mo>˜</mml:mo></mml:mover><mml:mn>1</mml:mn><mml:mo>±</mml:mo></mml:msubsup></mml:msub></mml:math> are still widely allowed. For the bino-dominated scenario, we find that, although slightly non-trivial, the region with low tan β with heavy higgsinos is preferred. In the case of universal slepton masses, the low mass regions with $$ {m}_{\tilde{\mu}} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>m</mml:mi><mml:mover><mml:mi>μ</mml:mi><mml:mo>˜</mml:mo></mml:mover></mml:msub></mml:math> ≲ 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 $$ {m}_{\tilde{\mu}} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>m</mml:mi><mml:mover><mml:mi>μ</mml:mi><mml:mo>˜</mml:mo></mml:mover></mml:msub></mml:math> ≲ 1 . 3 TeV.