One-loop Weak Dipole Form Factors and Weak Dipole Moments of Heavy Fermions

Abstract

The one-loop weak-magnetic and weak-electric dipole form factors of heavy fermions in a generic model are derived. Numerical predictions for the $\tau$ lepton and $b$ quark Weak Anomalous Magnetic and Electric Dipole Moments (AWMDM and WEDM) in the SM and MSSM are reviewed. The MSSM contribution to the $\tau$ ($b$) AWMDM could be, in the high $\tan\beta$ scenario, four (thirty) times larger than the Electroweak SM one, but still a factor five below the QCD contribution (in the $b$ case). More interesting is the CP-odd sector where the contribution to the $\tau$ ($b$) WEDM in the MSSM could be up to twelve orders of magnitude larger than in the SM.