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The di-photon decay channel of the lightest Higgs boson is considerd as aprobe to explore CP violation in the Minimal Supersymmetric Standard Model(MSSM). The scalar/pseudo-scalar mixing is considered along with CP violationentering through the Higgs-sfermion-sfermion couplings, with and without lightsparticles. The impact of a light stop on the decay width and Branching Ratio(BR) is established through a detailed study of the amplitude of the process H1--> gamma.gamma. The other sparticles have little influence even when they arelight. With a suitable combination of other MSSM parameters, a light stop canchange the BR by more than 50 % with a CP-violating phase phi_mu ~ 90 deg.,while the change is almost nil with a heavy stop.

Exploring the Di-Photon Decay of a Light Higgs Boson in the MSSM With Explicit CP Violation