Probing the messenger of supersymmetry breaking by the muon anomalous magnetic moment

Abstract

Motivated by the recently measured muon anomalous magnetic moment a(mu), we examine the supersymmetry contribution to a(mu) in various mediation models of supersymmetry breaking which lead to predictive flavor conserving soft parameters at high energy scale. The studied models include dilaton or modulus-mediated models in heterotic string or M theory, gauge-mediated model, no-scale or gaugino-mediated models, and also the minimal and deflected anomaly-mediated models. For each model, the range of a(mu)(SUSY) allowed by other experimental constraints, e.g., b --> s gamma and the collider bounds on superparticle masses, is obtained together with the corresponding parameter region of the model. Gauge-mediated models with a low messenger scale can give any a(mu)(SUSY) within the 2 sigma bound. In many other models, b-->s gamma favors a(mu)(SUSY) smaller than either the - 1 sigma value (26 X 10(-10)) or the central value (42 X 10(-10)).