CP-violating Higgs sector of the MSSM through gluon.gluon --> H1 -->   gamma.gamma
  We study the effect of explicit CP violation in the Higgs sectors of the MSSM in the di-photon decay of the lightest CP-mixed Higgs state. Further it is shown that the gluon fusion production mechanism along with the di-photon decay enhances CP-violating effects for a large set of suitably chosen parameter values. 
S. Hesselbach, S. Moretti, S. Munir, P. Poulose
hep-ph