发表机构
Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS)（宇宙理论物理中心，基础科学研究院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究扩展标准模型构造$SU(N)$强耦合暗 sector，利用暗夸克与标准模型费米子同多重态的特点，分析其混合表示、味结构、整体对称性，研究暗 sector 与标准模型间的各类门户，为暗 sector 实验搜寻提供指导。
AI 中文摘要
受暗QCD sector可能存在的启发，我们通过将标准模型（SM）规范群扩展为更大的$SU(N+5)\times SU(N+1)\times U(1)$，构造了$SU(N)$强耦合暗sector，暗夸克候选者自然产生于与SM费米子相同的多重态。该扩展产生的暗QCD sector继承了SM的丰富结构，具有三个不同性质：（1）混合表示：存在三种不同表示的暗夸克，包括基础表示（$\chi_f$）、反对称表示（$\chi_a$）和对称表示（$\chi_s$），这些可追溯至SM的手征结构；（2）味：每种表示具有三代，其味结构和汤川相互作用与SM直接相关；（3）整体对称性：除了常规的重子数$D$外，我们还从守恒的$(B-L)-\widetilde{D}$对称性中识别出一种奇异暗重子数$\widetilde{D}$。这些特性为暗QCD sector的结构提供了新视角。此外，标量和规范sector的扩展引入了暗QCD sector与SM sector之间的各类门户，我们系统研究了这些门户，包括夸克门户、轻子门户、希格斯和$Z$门户、重$Z'$门户、动力学混合门户、偶极门户以及暗π/轴子门户。借助具体的UV模型，这些门户的起源变得可靠，为暗sector的实验搜寻提供了额外指导。
英文摘要
Motivated by the potential existence of a dark QCD sector, we construct a $SU(N)$ strongly coupled dark sector by extending the Standard Model (SM) gauge group to an enlarged $SU(N+5)\times SU(N+1)\times U(1)$, under which the dark quark candidates naturally arises from the same multiplets as the SM fermions. The dark QCD sector from the extension inherits the rich structure of the SM, featuring three distinct properties: (1) Mixed representations: There are dark quarks of three different representations, including fundamental ($χ_f$), antisymmetric ($χ_a$), and symmetric ($χ_s$), which can be traced back to the chiral structure of the SM. (2) Flavor: Each representation features three generations, with their flavor structures and Yukawa interactions directly related to those of the SM. (3) Global symmetries: Alongside the conventional dark baryon number $D$, we identify an exotic dark baryon number $\widetilde{D}$ from a conserved $(B-L)-\widetilde{D}$ symmetry. These features provide novel perspectives on the structure of dark QCD sectors. Furthermore, the extension of the scalar and gauge sectors introduces various portals between the dark QCD sector and the SM sector. We systematically study these portals, including quark portal, lepton portal, Higgs and $Z$ portal, heavy $Z'$ portal, kinetic mixing portal, dipole portal, and dark pion/axion portals. With a concrete UV model, their origin become robust, providing additional guidance for experimental searches of the dark sector.
Comments55 pages, 1 figure, 3 tables
