Light dark sector searches at low-energy high-luminosity e^＋e^- colliders

作     者：Peng-Fei Yin Shou-Hua Zhu 

作者机构：Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Institute of Theoretical Physics & State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Center for High Energy Physics Peking University Beijing 100871 China 

出 版 物：《Frontiers of physics》 (物理学前沿（英文版）)

年 卷 期：2016年第11卷第5期

页      面：9-22页

核心收录：

学科分类：0810[工学-信息与通信工程] 07[理学] 08[工学] 070202[理学-粒子物理与原子核物理] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：Acknowledgements This work was supported by the National Basic Research Program of China （973 Program） under Grant No. 2013CB837000  and the National Natural Science Foundation of China under Grants Nos. 11475189  11135003  and 11375014. 

主　　题：dark photon electron-positron collider dark matter 

摘      要：Although the standard model （SM） is extremely successful, there are various motivations for considering the physics beyond the SM. For example, the SM includes neither dark energy nor dark matter, which has been confirmed through astrophysical observations. Examination of the dark sector, which contains new, light, weakly-coupled particles at the GeV scale or lower, is well motivated by both theory and dark-matter detection experiments. In this mini-review, we focus on one particular case in which these new particles can interact with SM particles through a kinematic mixing term be- tween U（1） gauge bosons. The magnitude of the mixing can be parameterized by a parameter e. Following a brief overview of the relevant motivations and the constraints determined from numerous experiments, we focus on the light dark sector phenomenology at low-energy high-luminosity e^＋e^- colliders. These colliders are ideal for probing the new light particles, because of their large production rates and capacity for precise resonance reconstruction. Depending on the details of a given model, the typical observed signatures may also contain multi lepton pairs, displaced vertices, and/or missing energy. Through the use of extremely large data samples from existing experiments, such as KLOE, CLEO, BABAR, Belle, and BESIII, the ε 〈 10^-4-10^-3 constraint can be obtained. Obviously, future experiments with larger datasets will provide opportunities for the discovery of new particles in the dark sector, or for stricter upper limits on ε. Once the light dark sector is confirmed, the particle physics landscape will be changed significantly.