In this letter we study the specific sensitivity and constraints to soft breaking Z2 parameter m12 of Two Higgs Doublet Model (2HDM). is considered here as an input model together with masses bosons, mh, mH, mA, mH±, ratio two vacuum expectation values, tanβ, cos(β−α), α β mixing angles CP-even CP-odd sector, respectively. We explore in particular decays lightest boson h photons, assuming: 1)...