Detecting hidden sector dark matter at HL-LHC and HE-LHC via long-lived stau decays
Detecting hidden sector dark matter at HL-LHC and HE-LHC via long-lived stau decays
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DOI：
10.1103/physrevd.99.055037
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发表时间：
2019-02
影响因子：
5
通讯作者：
A. Aboubrahim;P. Nath
中科院分区：
文献类型：
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作者：
A. Aboubrahim;P. Nath
研究了一类超引力模型，其中标准模型规范群的超引力模型被一个隐扇区U（1）X规范群扩展，隐扇区中最轻的超对称粒子是中性伴子.我们在一类模型中研究了这种可能性，其中stau是MSSM扇区中最轻的超对称粒子，并且是$U（1）X$-扩展SUGRA模型中次轻的超对称粒子。在这种情况下，Stau将衰变为隐藏扇区的中性伴子。当Stau和隐扇形中性伴子之间的质量差很小，U（1）Y和U（1）X之间的混合也很小时，Stau可以衰变为隐扇形中性伴子和τ，τ可以重建为来自带电Stau的高p_T$径迹的位移径迹。对HL-LHC和HE-LHC进行了这种可能性的模拟。发现这样一个移位的轨道从一个stau将表明存在隐藏的部门暗物质。
We investigate a class of models where the supergravity model with the standard model gauge group is extended by a hidden sector $U(1)_X$ gauge group and where the lightest supersymmetric particle is the neutralino in the hidden sector. We investigate this possibility in a class of models where the stau is the lightest supersymmetric particle in the MSSM sector and the next-to-lightest supersymmetric particle of the $U(1)_X$-extended SUGRA model. In this case the stau will decay into the neutralino of the hidden sector. For the case when the mass gap between the stau and the hidden sector neutralino is small and the mixing between the $U(1)_Y$ and $U(1)_X$ is also small, the stau can decay into the hidden sector neutralino and a tau which may be reconstructed as a displaced track coming from a high $p_T$ track of the charged stau. Simulations for this possibility are carried out for HL-LHC and HE-LHC. The discovery of such a displaced track from a stau will indicate the presence of hidden sector dark matter.