论文标题

遗物对矢量般的费米子作为黑暗部门的连接器的挑战

Relic Challenges for Vector-Like Fermions as Connectors to a Dark Sector

论文作者

Carvunis, Alexandre, McGinnis, Navin, Morrissey, David E.

论文摘要

新的黑暗部门由外来田地组成,这些领域仅对标准模型(SM)非常虚弱,具有强大的理论动机,并且可能与解释丰富的暗物质(DM)有关。对于此类部门来说,一个重要的问题是它们如何连接到SM。对于具有新规格相互作用的黑暗区域,自然连接是由在可见的和深色仪表组下收到的重型矢量般的fermions产生的。这种费米子的仪表充电表明,在没有其他深色对称性折断的来源的情况下,其中一个或多个是稳定的。对于此类连接器而言,一般的挑战是,如果它们在早期的宇宙中曾经被热化,它们可能会产生太多的暗物质或与核相互作用。在本文中,我们在一个简单的连接器理论中研究了这一挑战,该理论由新的矢量式电动二重奏和单身手费组成,它们在新的(Abelian)仪表力的基本表示下也会转变,我们证明这些连接器的最低形式几乎总是由现有直接DM搜索所掩盖。为了应对这一挑战,我们研究了两种解决方案。首先,我们通过引入单元的主要质量术语来研究核上的缓解散射。其次,我们研究了与Sm瘦素的混合物,该混合物使连接器腐烂,同时与宇宙学测试保持一致,并寻找违反带电的Lepton风味。两种解决方案都依赖于具有特定电荷的深色希格斯场的存在。

New dark sectors consisting of exotic fields that couple only very feebly to the Standard Model (SM) have strong theoretical motivation and may be relevant to explaining the abundance of dark matter (DM). An important question for such sectors is how they connect to the SM. For a dark sector with a new gauge interaction, a natural connection arises from heavy vector-like fermions charged under both the visible and dark gauge groups. The gauge charges of such fermions imply that one or more of them is stable in the absence of additional sources of dark symmetry breaking. A generic challenge for such connectors is that they can produce too much dark matter or interact too strongly with nuclei if they were ever thermalized in the early universe. In this paper we study this challenge in a simple connector theory consisting of new vector-like electroweak doublet and singlet fermions that also transform under the fundamental representation of a new (Abelian) gauge force, and we show that these connectors in their minimal form are almost always ruled out by existing direct DM searches. To address this challenge, we investigate two solutions. First, we study mitigating scattering on nuclei by introducing a Majorana mass term for the singlet. And second, we investigate a mixing with SM leptons that allows the connectors to decay while remaining consistent with cosmological tests and searches for charged lepton flavor violation. Both solutions rely on the presence of a dark Higgs field with a specific charge.

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