CP violation of Extended Higgs sector and Its impact on D^0 -> mu^+ mu^-   decay
  We study the impact of the CP violation of the extra Higgs sector on $D^0$ decay. The CP even and CP odd neutral Higgs mixing of the two Higgs doublet model is studied and we show how the CP violating effect of the mixing may lead to the longitudinal muon polarization asymmetry of $D^0 \to \mu^+ \mu^-$. The asymmetry of the short-distance contribution is sensitive to the CP violating phase of the extended Higgs sector. 
Daiji Kimura (Hiroshima University), Kang Young Lee (Konkuk   University), Takuya Morozumi (Hiroshima University)
hep-ph