A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess

A simplified 2HDM with a scalar dark matter and the galactic center gamma-ray excess
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具有标量暗物质和银河系中心伽马射线过剩的简化 2HDM

DOI:
10.1016/j.physletb.2014.11.016
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发表时间:
2014-06
期刊:
影响因子:
4.4
通讯作者:
Xiao-Fang Han
Xiao-Fang Han
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lei Wang;Xiao-Fang Han

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由于 LUX 实验的强烈约束,标量门暗物质通常不能通过暗物质湮灭到 b b 来解释银河系中心的伽马射线过剩。出于消除张力的动机,我们在对齐的双希格斯双峰模型中添加了标量暗物质,并关注一个简化的场景,该场景具有两个主要特征:(i)重CP偶希格斯玻色子是已发现的125 GeV希格斯玻色子,其与规范玻色子和费米子的耦合与SM希格斯相同。(ii)只有轻CP偶希格斯介导暗物质与SM粒子的相互作用,这与 WW 和 ZZ 没有耦合,但与上型夸克、下型夸克和带电轻子有独立耦合。我们发现,对于− 1.0< f n/f p< 0.7 的同位旋破坏暗物质-核子耦合,< σ v> SS→ b b´ 之间的张力和标量门户暗物质引起的 LUX 约束可以消失,并且也满足希格斯搜索实验和普朗克遗迹密度的约束。
Due to the strong constraint from the LUX experiment, the scalar portal dark matter cannot generally explain a gamma-ray excess in the galactic center by the annihilation of dark matter to b b¯. With the motivation of eliminating the tension, we add a scalar dark matter to the aligned two-Higgs-doublet model, and focus on a simplified scenario, which has two main characteristics:(i) The heavy CP-even Higgs is the discovered 125 GeV Higgs boson, which has the same couplings to the gauge bosons and fermions as the SM Higgs.(ii) Only the light CP-even Higgs mediates the dark matter interactions with SM particles, which have no couplings to WW and ZZ, but have the independent couplings to the up-type quarks, down-type quarks and charged leptons. We find that the tension between< σ v> SS→ b b¯ and the constraint from LUX induced by the scalar portal dark matter can go away for the isospin-violating dark matter–nucleon coupling with− 1.0< f n/f p< 0.7, and the constraints from the Higgs search experiments and the relic density of Planck are also satisfied.
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