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arXiv 2107.12934hep-ph
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轻赝标量暗物质模型

A model of light pseudoscalar dark matter

Shreyashi Chakdar, Dilip Kumar Ghosh, P. Q. Hung, Najimuddin Khan, Dibyendu Nanda

AI总结:

本文在 EW-ν_R 模型中提出以复单态标量的虚部 A_s^0 作为自然轻的亚 MeV PNG 暗物质,并证明冻入而非冻结机制可给出符合观测与实验约束的遗迹密度。

摘要:

构建 EW-ν_R 模型是为了提供一种在电弱标度 Λ_EW ~ 246 GeV 下运行的跷跷板情景,同时保持与标准模型(SM)相同的规范结构。在该模型中,右手中微子并非惰性粒子,其质量处于 Λ_EW 量级。它们可与重的镜像夸克和轻子一起在 LHC 上被寻找,其中最轻的粒子具有较大的衰变长度。跷跷板机制要求存在一个在 SM 规范群下为单态的复标量。本文提出,该复标量的虚部(记为 A_s^0)是一种亚 MeV 暗物质候选者。我们发现,这种亚 MeV 标量可作为可行的非热弱相互作用大质量粒子(FIMP)暗物质候选者。由于 A_s^0 在模型中具有赝 Nambu-Goldstone(PNG)玻色子的性质,它可以自然地成为轻的亚 MeV 暗物质候选者。我们表明,在这一特定框架中,经过充分研究的冻结机制并不适用,因为它会产生过量的暗物质。我们确认,冻入机制能够为这种亚 MeV 暗物质候选者产生正确数量级的遗迹密度,并满足所有适用约束。随后,我们讨论了当前直接和间接搜寻界限所允许的该亚 MeV 暗物质参数空间。该模型具有非常丰富的标量扇区,与多种实验约束相符,并预言了一个具有 SM Higgs 特征、质量约 125 GeV 的标量,满足当前 LHC Higgs 玻色子数据。

英文摘要:

The EW-$ν_R$ model was constructed in order to provide a seesaw scenario operating at the Electroweak scale $Λ_{EW} \sim 246$ GeV, keeping the same SM gauge structure. In this model, right-handed neutrinos are non-sterile and have masses of the order of $Λ_{EW}$. They can be searched for at the LHC along with heavy mirror quarks and leptons, the lightest of which have large decay lengths. The seesaw mechanism requires the existence of a complex scalar which is singlet under the SM gauge group. The imaginary part of this complex scalar denoted by $A^{0}_s$ is proposed to be the sub-MeV dark matter candidate in this manuscript. We find that the sub-MeV scalar can serve as a viable non-thermal feebly interacting massive particle (FIMP)-DM candidate. This $A_s^0$ can be a naturally light sub-MeV DM candidate due to its nature as a pseudo-Nambu-Goldstone (PNG) boson in the model. We show that the well-studied freeze out mechanism falls short in this particular framework producing DM overabundance. We identify that the freeze in mechanism produce the correct order of relic density for the sub-MeV DM candidate satisfying all applicable constraints. We then discuss the DM parameter space allowed by the current bounds from the direct and indirect searches for this sub-MeV DM. This model has a very rich scalar sector, consistent with various experimental constraints, predicts a $\sim 125$ GeV scalar with the SM Higgs characteristics satisfying the current LHC Higgs boson data.

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