CP Violation in W Pair Production via Photon-Photon Collisions Within the THDM-III with FCNC**The project supported in part by National Natural Science Foundation of China (19675033) and Youth Science Foundation of the University of Science and Technology of China

Abstract

The CP-violating effects in the W pair production via photon-photon collisions are investigated in the frame of the THDM-111 with complex neutral current couplings. The numerical calculations manifest the resonance effect and the counteractive behaviour in CP asymmetries between the two CP-violating contributing parts from the h0 and H0 exchanging s-channel diagrams. We conclude that if the masses of the two neutral Higgs bosons H0 and h0 are quantitatively largely separated and the colliding energy of photons is close to the mass of h0 or H0, the CP-violating effect is possibly to be observed in this process.