论文标题
Kaluza-Klein模式的动力学混合：门户问题的简单结构
Kinetic Mixing from Kaluza-Klein Modes: A Simple Construction for Portal Matter
论文作者
论文摘要
矢量门户/动力学混合暗物质的简化模型，其中质量的热暗物质从几台MeV到几个GEV可以通过深色扇区$ u（1）$来实现，这取决于此深色$ u（1）$和标准模型（SM）HyperCharge之间的小动力学混合项。众所周知，可以通过包含“门户物质”字段来在一个循环中生成动力学混合，这些字段都在黑暗的$ u（1）$和SM超负荷下都收取，并且以前在现象学的基础上进行了争论，这些理由是基于Fermionic Portal Matters Fields必须表现出特定的特征，它们必须表现出相同的标准模型。 A natural explanation for the presence of dark $U(1)$-charged copies of SM fermions would be to enlarge the dark gauge group and embed the SM and the portal matter into a single dark multiplet, however, previous works in this direction require significant ad hoc additions to ensure that the portal matter fields are vector-like while the SM fields are chiral, and rely on complicated dark Higgs sectors to realize the appropriate symmetry breaking.在本文中，我们认为，具有较大额外尺寸的模型可以轻松地从单个深色散装多重多集中生成手性sm fermions和矢量样门户物质，同时允许更简单的深色希格斯扇区。我们介绍了这种“ Kaluza-Klein（KK）Portal Matters”的最小结构，并在LHC上探索了其现象学，并指出，即使我们的简单实现也表现出具有更大额外尺寸和4-D门户物质的更常规模型的特殊标志。一般而言，门户问题领域将比模型中的其他KK字段轻得多，因此门户问题扇区有可能成为第一个可观察到的额外维度的实验性签名。
The vector portal/kinetic mixing simplified model of dark matter, in which thermal dark matter of a mass ranging from a few MeV to a few GeV can be realized with a dark-sector $U(1)$, relies on a small kinetic mixing term between this dark $U(1)$ and the Standard Model (SM) hypercharge. It is well-known that kinetic mixing of the right magnitude can be generated at one loop by the inclusion of "portal matter" fields which are charged under both the dark $U(1)$ and the SM hypercharge, and it has been previously argued on phenomenological grounds that fermionic portal matter fields must exhibit a specific set of characteristics: They must be vector-like and have the same Standard Model group representations as existing SM fermions. A natural explanation for the presence of dark $U(1)$-charged copies of SM fermions would be to enlarge the dark gauge group and embed the SM and the portal matter into a single dark multiplet, however, previous works in this direction require significant ad hoc additions to ensure that the portal matter fields are vector-like while the SM fields are chiral, and rely on complicated dark Higgs sectors to realize the appropriate symmetry breaking. In this paper, we argue that a model with large extra dimensions can easily generate chiral SM fermions and vector-like portal matter from a single dark bulk multiplet, while allowing for a far simpler dark Higgs sector. We present a minimal construction of this "Kaluza-Klein (KK) portal matter" and explore its phenomenology at the LHC, noting that even our simple realization exhibits signatures unique from those of more conventional models with large extra dimensions and 4-D portal matter. Generically, the portal matter sector fields will be much lighter than the other KK fields in the model, so the portal matter sector has the potential to be the first observable experimental signature of an extra dimension.
