Muon g-2 and CP violation in MSSM

Abstract

We study the constraints of the CP violation in the muon $g-2$ preferred region of the minimal supersymmetric standard model assuming a universal slepton masses within first two generations. We present two particular scenarios where the $g-2$ anomaly is predicted within 2 $\ddot{I}ƒ$ level mainly through the chargino loop or the bino loop. We found that for both cases the electron EDM experiment already highly constrained the CP phase of the parameters: either the Arg[$\hat{I}¼M_1]$ or Arg[$\hat{I}¼M_2]$ should be smaller than $\mathcal{O}$(2-3)$\times 10^{-5}$. If the muon $g-2$ anomaly is explained by the MSSM, a particular SUSY breaking mechanism is needed to guarantee the small CP phase of SUSY parameters. Otherwise, a tuning of $\mathcal{O}(10^{-5})$ is needed to cancel the phase in a general CP violated SUSY model.

6 Pages, 2 figures