Can the new resonance at LHC be a CP-Odd Higgs boson?

TL;DR

This paper investigates whether a recently observed LHC resonance could be a CP-odd Higgs boson within two Higgs doublet models, analyzing its consistency with experimental data and theoretical constraints.

Contribution

It demonstrates that a 750 GeV CP-odd Higgs boson can fit the LHC resonance and be compatible with existing electroweak and low-energy data in a generic 2HDM framework.

Findings

The charged Higgs and other scalar masses are bounded by the resonance mass.

The scenario is consistent with electroweak precision tests.

Compatibility with leptonic and semileptonic decay data is shown.

Abstract

A plausible explanation of the recent experimental indication of a resonance in the two-photon spectrum at LHC is that it corresponds to the CP-odd Higgs boson. We explore such a possibility in a generic framework of the two Higgs doublet models (2HDM), and combine $m_A \approx 750$GeV with the known $m_h =125.7(4)$~GeV to show that the charged Higgs boson and the other CP-even scalar masses become bounded from bellow and from above. We show that this possibility is also consistent with the electroweak precision data and the low energy observables, which we test in a few leptonic and semileptonic decay modes.