Speaker
Description
Searches are being carried out for the decay $A^{0}\rightarrow hZ^{*}$ in the normal hierarchy (with $m_{h}=125$ GeV)at the Large Hadron Collider (LHC) in the context of Two-Higgs-Doublet Models (2HDMs). In this study, we focus on the decay $A^{0}\rightarrow hZ^{*}$ in the inverted hierarchy scenario where $m_{h}$ can be significantly lighter than 125 GeV. This research in this scenario has not been carried out experimentally by ATLAS and CMS. In order to find a region that respects all theoretical and experimental constraints with a visible signal, we do a scan over the 2HDM Type-I parameter space, by using the public code 2HDMC-1.8.0 interfaced with HiggsBounds and HiggsSignals and flavour constraints using SuperISO.
We calculate the product $gg\rightarrow A^{0}\rightarrow h Z^{(*)}\rightarrow Z^{(*)} b\vec{b}$ at $\sqrt{s}=$ 13 in 2HDM type I in the region $m_{A^{0}}<$ 225 GeV and compare its magnitude with the result from the CMS Collaboration in the normal hierarchy ($m_{h}$ = 125 GeV). It shows that in the inverted hierarchy scenario we seem to have significantly larger cross sections for product $gg\rightarrow A^{0}\rightarrow h Z^{(*)}\rightarrow Z^{(*)} b\vec{b}$ than in the normal hierarchy case. A manuscript of the study was submitted on arxiv, arXiv:2301.00728.
