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arXiv 1805.04423hep-ph
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单重态-二重态暗物质冻结:LHC位移信号与宇宙学

Singlet-Doublet Dark Matter Freeze-in: LHC displaced signatures versus cosmology

Lorenzo Calibbi, Laura Lopez-Honorez, Steven Lowette, Alberto Mariotti

摘要:

我们研究了弱耦合区的单重态-二重态暗物质模型,其中的暗物质丰度是通过冻结机制得到的。由于小的耦合,模型中较重的粒子在对撞机实验的典型尺度下具有长寿命的衰变长度。我们分析的碰撞机签名的模型,其特征在于位移$h$和$Z$玻色子加上丢失的动量,采用当前的大型强子对撞机搜索位移顶点和丢失的能量显着约束的参数空间的模型。我们还考虑到我们的光暗物质候选人从莱曼- $α$森林约束相关的宇宙学边界。我们的分析强调了在大型强子对撞机和宇宙学的暗物质候选人,其遗迹丰度是通过冻结机制获得的位移签名之间的相互作用。

英文摘要:

We study the Singlet-Doublet dark matter model in the regime of feeble couplings, where the dark matter abundance is obtained via the freeze-in mechanism. As a consequence of the small couplings, the heavier particles in the model are long-lived with decay length at typical scales of collider experiments. We analyse the collider signatures of the model, characterised by displaced $h$ and $Z$ bosons plus missing momentum, employing current LHC searches for displaced vertices and missing energy to significantly constrain the parameter space of the model. We also take into account the cosmological bounds relevant for our light dark matter candidate arising from Lyman-$α$ forest constraints. Our analysis emphasises the interplay between displaced signatures at the LHC and cosmology for dark matter candidates whose relic abundance is obtained through the freeze-in mechanism.

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