Implications on the Heavy CP-even Higgs Boson from Current Higgs Data

TL;DR

Current Higgs data suggests potential signs of physics beyond the standard model, with implications for the properties and observability of the heavier CP-even Higgs boson in two-Higgs-doublet models.

Contribution

This paper analyzes how current Higgs measurements constrain the heavy CP-even Higgs boson in the two-Higgs-doublet model, highlighting its possible observability in future experiments.

Findings

Heavier Higgs can decay into tau pairs with large branching ratio.

Heavy Higgs observable in associated production with bar{b}.

Current data favors a specific parameter region with  and moderate .

Abstract

The current Large Hadron Collider data indicates that the newly observed resonance has the WW and ZZ modes consistent with the standard model Higgs boson, while the \gamma\gamma mode is about 1.2 - 2 times that of the standard model prediction and the tau-pair mode is suppressed. If this pattern persists in the upcoming data, it would be a sign for physics beyond the standard model. In the type II two-Higgs-doublet model, it is the region where \sin\alpha \approx 0 and a moderately large \tan\beta = 10 - 20 that the lighter CP-even Higgs boson can accommodate the current data. We note that in this region the heavier CP-even Higgs boson must have a large decay branching ratio into tau pairs. We find that this heavier Higgs boson can be observable in the associated production with a b\bar b pair and through the decay into a tau pair.