Probing the scalar-pseudoscalar mixing in the 125 GeV Higgs particle with current data

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LHC has found hints for a Higgs particle of 125 GeV. We investigate the possibility that such a particle is a mixture of scalar and pseudoscalar states. For definiteness, we concentrate on a two Higgs doublet model with explicit CP violation and soft Z2 violation. Including all Higgs production mechanisms, we determine the current constraints obtained by comparing h -> gamma gamma with h -> V V*, and comment on the information which can be gained by measurements of h -> b b. We find bounds |s₂| < 0.83 at one sigma, where |s₂|=0 (|s₂|=1) corresponds to a pure scalar (pure pseudoscalar) state.