AI 中文总结
研究构建标准模型的无反常重子完备化，通过新规范因子\(U(1)_{\tilde B}\)实现，添加条件约束模型结构，扩大隐蔽费米子扇区产生轻赝标量，经多种工具分析确定可行参数空间区域及遗迹丰度决定方式。
AI 中文摘要
我们构建了一个规范重子数对称性的显式无反常完备化。新规范因子是\(U(1)_{\tilde B}\)，在标准模型场限制下其电荷\({\tilde B}\)与普通重子数一致，在完整理论中它成为作用于标准模型和一个隐蔽扇区的扩展重子对称性。仅反常消除有广泛解类，但加上对称破缺、奇异态衰变、无稳定色遗迹、\(Z_2^{\rm DM}\)宇称保护的中性暗物质候选者及改进的高标度规范耦合统一等要求，强烈约束了模型结构。这需要通过额外标量场和汤川相互作用扩大最小隐蔽费米子扇区，产生一个在暗物质现象学中起重要作用的轻赝标量。我们在SARAH中实现所得可重整化模型，并用SPheno、MicrOMEGAs、SModelS和HiggsTools分析其谱和现象学。确定了包含重子\(Z'\)、更重隐蔽扇区、与遗迹密度和直接探测约束兼容的中性暗物质候选者以及相对于标准模型改进的规范耦合演化的可行参数空间区域。在这些区域，遗迹丰度由与附近隐蔽态的共湮灭或向扩展标量扇区的轻赝标量的湮灭决定。
英文摘要
We construct an explicit anomaly-free completion of a gauged baryon-number symmetry. The new gauge factor is \(U(1)_{\tilde B}\): when restricted to the Standard Model fields its charge \({\tilde B}\) coincides with ordinary baryon number, whereas in the full theory it becomes an extended baryonic symmetry acting on both the Standard Model and a secluded sector. We show that anomaly cancellation alone leaves a broad class of solutions, but that requiring consistent symmetry breaking, viable decays of the exotic states, the absence of stable coloured relics, a neutral dark matter candidate protected by a \(Z_2^{\rm DM}\) parity, and improved high-scale gauge-coupling unification strongly constrains the structure of the model. These requirements necessitate enlarging the minimal secluded fermion sector by additional scalar fields and Yukawa interactions, giving rise to a light pseudoscalar that plays an important role in the dark matter phenomenology. We implement the resulting renormalisable model in SARAH and analyse its spectrum and phenomenology with SPheno, MicrOMEGAs, SModelS, and HiggsTools. We identify viable regions of parameter space containing a heavy baryonic Z', an even heavier secluded sector, a neutral dark matter candidate compatible with relic-density and direct-detection constraints, and improved gauge-coupling evolution relative to the Standard Model. In these regions, the relic abundance is determined either by co-annihilation with nearby secluded states or by annihilation into light pseudoscalars from the extended scalar sector.
Comments22 pages, 4 figures
