Search for neutral Higgs bosons decaying to b(b)over-bar in the flipped 2HDM at future e- e+ linear colliders

被引：4

作者：

Hashemi, Majid ^{[1
]}

Haghighat, Gholamhossein ^{[1
]}

机构：

[1] Shiraz Univ, Dept Phys, Coll Sci, Shiraz 7194684795, Iran

来源：

PHYSICAL REVIEW D | 2019年 / 100卷 / 01期

关键词：

TREE-LEVEL UNITARITY; CONSERVATION-LAWS; BROKEN SYMMETRIES; PP COLLISIONS; DOUBLET MODEL; MASS; ENERGIES; BREAKING; BOUNDS; TEV;

D O I：

10.1103/PhysRevD.100.015047

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this study, assuming the type-Y (flipped) two-Higgs-doublet model (2HDM) in the Standard-Model-(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(+) -> AH -> b (b) over barb (b) over bar 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 -> b (b) over bar decays at relatively high tan beta 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).

引用

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