Abstract
In this study, assuming the Type-Y (flipped) 2HDM at the SM-like scenario as the theoretical framework, observability of the additional heavy neutral Higgs bosons $H$ and $A$ is investigated through the signal process chain $e^- e^+ \rightarrow AH \rightarrow b\bar{b}b\bar{b}$ at a linear collider operating at the center-of-mass energy of 1.5 TeV. The assumed signal process is highly motivated by the enhancements in the $A/H\rightarrow b\bar{b}$ decays at relatively high $\tb$ values. Such enhancements result in the dominance of the mentioned decay modes even for Higgs masses above the threshold of the on-shell top quark pair production. Taking advantage of such a unique feature, several benchmark scenarios are studied. Simulating the detector response based on the SiD detector at the ILC, simulated events are analyzed to reconstruct the $H$ and $A$ Higgs bosons. The top quark pair production and $Z/\gamma$ production are the main SM background processes and are well under control. Results indicate that, the $H$ and $A$ Higgs bosons are observable with signals exceeding $5\sigma$ with possibility of mass measurement in all the tested scenarios. Specifically, the parameter space region enclosed with the mass ranges $m_H$=150-500 GeV and $m_A$=230-580 GeV with the $A/H$ mass splitting of 80 GeV is observable at the integrated luminosity of 500 $fb^{-1}$.
Highlights
The Standard Model (SM) of elementary particles provided significant predictions which have been successfully verified by plenty of experimental observations
It will be shown that both of the H and A Higgs bosons are observable with signals exceeding 5σ with possibility of mass measurement in all the considered scenarios
We present a brief introduction to the 2HDM and different aspects of the analysis will be discussed
Summary
The Standard Model (SM) of elementary particles provided significant predictions which have been successfully verified by plenty of experimental observations. A significantly large portion of the parameter space can be probed with the help of the considered signal process This is a unique feature of the assumed signal process in the flipped 2HDM. Because of the chosen Higgs mass ranges and the assumed signal process, the present analysis is most suitable for a collider experiment performed at the center-of-mass energy of 1.5 TeV. Such an experiment can be performed by the LHC, a linear collider is assumed in this study since e−eþ linear colliders suffer less from background processes, underlying events, etc. We present a brief introduction to the 2HDM and different aspects of the analysis will be discussed
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