The c-quark EDM and production of $h_c$ in $e^{+}{e}^{-}$ annihilation

Abstract

We analyze the charm quark electric dipole moment (EDM) in the minimal supersymmetric extension of the standard model (MSSM), including important two-loop gluino contributions. Considering the experimental constraint on the neutron EDM, the theoretical prediction for the charm quark EDM can reach about $10^{-20}e\cdot cm$. If taking into account the mixing between the scharm and stop quarks in the effective supersymmetry scenario, the charm quark EDM can be enhanced to $\sim 10^{-19}e\cdot cm$. Direct production of the CP-odd ${}^1{P}_1$ state $h_c$ in $e^{+}{e}^{-}$ annihilation via the CP-violating process at the BES-III and CLEO-C is analyzed.

Comments: 21 pages, 10 figures