Minicharged Particles at Accelerators: Progress and Prospects
University of Alberta（阿尔伯塔大学）；University of Regina（里贾纳大学）；Instituto de Física Corpuscular, CSIC–Universitat de València（瓦伦西亚大学-CSIC粒子物理研究所）
Marc de Montigny, Pierre-Philippe A. Ouimet, James Pinfold, Ameir Shaa, Michael Staelens
备注：
22 pages, 3 figures. Paper accepted for publication in the European Physical Journal ST issue titled The MoEDAL-MAPP Experiment $\unicode{x2014}$ The LHC's First Dedicated Search Experiment for BSM Physics
Minicharged particles (mCPs), hypothetical free particles with effective electric charges much smaller than the elementary charge, $e$, offer a valuable probe of dark sectors and fundamental physics through several clear experimental signatures. Various models of physics beyond the Standard Model predict such particles, the existence of which could help elucidate the ongoing mysteries regarding electric charge quantization and the nature of dark matter. Moreover, a hypothetical scenario involving a small minicharged subcomponent of dark matter has recently been demonstrated as a viable explanation of the anomaly in the 21 cm hydrogen absorption signal reported by the EDGES collaboration. Although several decades of indirect observations and direct experimental searches for mCPs at particle accelerators have led to severe constraints, a substantial window of the mCP mass$\unicode{x2013}$mixing parameter space remains unexplored at the energy frontier accessible to current state-of-the-art accelerators, such as the Large Hadron Collider (LHC). Consequently, mCPs have remained topical over the years, and new experimental searches at accelerators have been gaining interest. In this article, we review the theoretical frameworks in which mCPs emerge and their phenomenological implications, the current direct and indirect constraints on mCPs, and the present state of the ongoing and upcoming searches for mCPs at particle accelerators.
Prospects for Detecting Supersymmetric Dark Matter at Post-LEP Benchmark Points
最近提出了一套新的超对称基准场景的上下文中的约束MSSM（CMSSM）与通用软超对称性破缺群众，考虑到从LEP，$b \to s γ$和$g_μ- 2$的约束。这些观点以前曾被用来讨论不同加速器的物理范围。在本文中，我们讨论了在这些情况下发现超对称暗物质的前景。我们考虑直接检测通过自旋无关和自旋相关的核散射，以及间接检测通过遗迹湮灭中微子，光子和正电子。我们发现，几个基准方案提供了良好的前景，通过自旋无关的核散射直接检测和间接检测通过中微子产生的太阳内部的遗迹湮灭的μ子，和一些模型提供了良好的前景检测光子遗迹湮灭在银河系中心。
Is it possible to discover a dark matter particle with an accelerator?
论文内容包括描述银河系暗物质（DM）粒子的主要性质，探测DM的可用方法，直接DM探测的主要特征，估计DM探测前景的方法，在有效场论内首次用对撞机搜索DM候选者，用LHC RUN I对DM候选者搜索的ATLAS结果的完整回顾，和不太完整的审查“异国情调”暗粒子搜索与其他加速器，而不仅仅是。从这些考虑可以得出，人们无法证明，特别是模型独立地，用加速器或对撞机发现DM粒子。人们只能获得弱相互作用中性粒子存在的证据，它可能是，也可能不是DM候选者。目前的LHC DM搜索程序只使用丢失的横向能量信号。没有观察到任何超出标准模型预期的情况，迫使LHC实验进入同样的争夺最佳排除曲线的斗争，其中（几乎）所有直接和间接的DM搜索实验永久发生。但这场斗争与发现DM粒子的真正可能性几乎没有任何关系。真正的DM粒子拥有独特的银河系签名-每年调制的信号，这是今天只有直接DM检测实验。用对撞机或加速器是不可能的。因此，为了证明对撞机发现的候选者的DM性质，必须在直接DM实验中找到候选者，并证明候选者的银河签名。此外，要观察到DM粒子，必须将其纳入现代理论框架。最好的候选者是超对称性，它在今天看来是所有可用DM数据的一致解释的必然结果。
Primordial black holes as cosmic accelerators of light dark matter: Novel direct detection constraints
State Key Laboratory of Dark Matter Physics, Tsung-Dao Lee Institute & School of Physics and Astronomy, Shanghai Jiao Tong University（上海交通大学物理与天文学院、紫江研究院暗物质国家重点实验室）；Key Laboratory for Particle Astrophysics and Cosmology (MOE) & Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University（上海交通大学粒子天体物理与宇宙学教育部重点实验室、上海粒子物理与宇宙学重点实验室）；Indian Institute of Science Education and Research - Bhopal（印度科学教育研究所博帕尔分校）
