arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1909.08684hep-phhep-ex
收藏

具有隐藏扇形暗物质的LHC现象学:可观测范围内的长寿命Stau和重Higgs

LHC phenomenology with hidden sector dark matter: a long-lived stau and heavy Higgs in an observable range

Amin Aboubrahim, Pran Nath

摘要:

与标准模型具有非常弱相互作用的隐藏扇区的存在对LHC签名具有重要意义。在这项工作中,我们讨论了LHC的现象,包括一个隐藏的部门由$U(1)$扩展MSSM/SUGRA。我们考虑动力学混合和Stueckelberg质量混合之间的$U(1)$规范场的隐藏部门和$U(1)_Y$的可见部门。这种模型具有扩展的参数空间。我们在这里考虑这个参数空间的两个有限区域。在第一种情况下,我们考虑一个$U(1)$规范场随着手征领域所需的施图克尔伯格机制的操作和讨论之间的混合隐藏和可见的部门。在这里,如果Stau是MSSM扇区中最轻的超粒子,而隐藏扇区的中性伴子是整个系统的LSP和暗物质候选者,那么Stau可以是长寿的,并在LHC探测器跟踪器内衰变。在第二种情况下,我们在隐藏扇区中包含额外的类矢量物质,除了隐藏扇区中的两个中性伴子之外,它还可以产生狄拉克费米子。中性伴子区现在有6个中性伴子,我们假设其中最轻的是LSP,并且是类希格西诺的。在这种情况下,暗物质由马约拉纳费米子和狄拉克费米子组成,小的$μ$导致重的希格斯玻色子质量,它们位于HL-LHC和HE-LHC的可观测范围内。

英文摘要:

The presence of a hidden sector with very weak interactions with the standard model has significant implications on LHC signatures. In this work we discuss LHC phenomenology with the inclusion of a hidden sector by a $U(1)$ extension of MSSM/SUGRA. We consider both kinetic mixing and Stueckelberg mass mixing between the $U(1)$ gauge field of the hidden sector and $U(1)_Y$ of the visible sector. Such a model has an extended parameter space. We consider here two limited regions of this parameter space. In the first case we consider a $U(1)$ gauge field along with chiral fields needed for the Stueckelberg mechanism to operate and discuss the mixing between the hidden and the visible sectors. Here if the stau is the lightest sparticle in the MSSM sector and the neutralino of the hidden sector is the LSP of the full system and a dark matter candidate, the stau can be long-lived and decay inside an LHC detector tracker. In the second case we include extra vectorlike matter in the hidden sector which can give rise to a Dirac fermion in addition to the two neutralinos in the hidden sector. The neutralino sector now has six neutralinos and we assume that the lightest of these is the LSP and is higgsino-like. In this case the dark matter is constituted of a Majorana and a Dirac fermion, and a small $μ$ leads to heavy Higgs boson masses which reside in the observable range of HL-LHC and HE-LHC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑