Electric dipole moment of the muon in a two Higgs doublet model

The electric dipole moment of the muon (d_μ) is evaluated in a two Higgs doublet model with a softly broken discrete symmetry. The leading contributions from both one-loop and two-loop diagrams are considered. For tanβ≡|v₂|/|v₁| close to one, contributions from two-loop diagrams involving the t quark and the W boson dominate, while for tanβ10, contributions from two-loop diagrams involving the b quark and the τ lepton are dominant. In these two regions, d_μ≈(m_μ/mₑ)dₑ. For 8tanβ4, significant cancellation occurs among the contributions from two-loop diagrams and the one-loop contribution dominates for tanβ~7. For tanβ15, the calculated d_μ can be close to the reach of a recently proposed experiment at the Brookhaven National Laboratory.