Tan β-enhanced supersymmetric corrections to the anomalous magnetic moment of the muon

We report on a two-loop supersymmetric contribution to the magnetic moment (g-2)μ of the muon which is enhanced by two powers of tanβ. This contribution arises from a shift in the relation between the muon mass and Yukawa coupling and can increase the supersymmetric contribution to (g-2)μ sizably. As a result, if the currently observed 3σ deviation between the experimental and SM theory value of (g-2)μ is analyzed within the minimal supersymmetric standard model (MSSM), the derived constraints on the parameter space are modified significantly: If (g-2)μ is used to determine tan β as a function of the other MSSM parameters, our corrections decrease tanβ by roughly 10% for tan β=50.