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

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→γγ with h→VV*, and comment on the information which can be gained by measurements of h→bb̄. We find bounds |s₂|0.83 at one sigma, where |s₂|=0 (|s₂|=1) corresponds to a pure scalar (pure pseudoscalar) state.