Comprehensive study of two Higgs doublet model in light of the new boson with mass around 125 GeV

Understand

The recent discovery of a new boson of mass roughly 125 GeV has been reported by the ATLAS and CMS collaborations.

• Although its signals in various decay modes resemble those of the standard model (SM) Higgs boson, observed are the combinations of entangled information about the production, decay rates and total decay width of the new boson.
• In addition, some decay channels show non-negligible deviation from the SM expectation, such as the $2\sigma$ excess in the diphoton channel.
• In the four types (I, II, X and Y) of two Higgs doublet models, we perform the global $\chi^2$ fit in three scenarios: (i) the new boson is the light CP-even Higgs boson $h^0$; (ii) it is the heavy CP-even Higgs boson $H^0$; (iii) the signals are from degenerate $h^0$ and the pseudoscalar $A^0$.