Exploring the lifetime frontier with a beam-dump experiment at CiADS

作     者：Chen, Liangwen Du, Mingxuan Sun, Zhiyu Wang, Zeren Simon Xie, Fang Xie, Ju-Jun Yang, Lei Yu, Pei Zhang, Yu 

作者机构：Heavy Ion Science and Technology Key Laboratory Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China Advanced Energy Science and Technology Guangdong Laboratory Huizhou516000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing101408 China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing100871 China Center for High Energy Physics Peking University Beijing100871 China Department of Physics National Tsing Hua University Hsinchu300 Taiwan Center for Theory and Computation National Tsing Hua University Hsinchu300 Taiwan Institute of Modern Physics Fudan University Shanghai200433 China  Institute of Modern Physics Chinese Academy of Sciences Guangdong Huizhou516000 China School of Physics Hefei University of Technology Hefei230601 China 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2024年

核心收录：

主　　题：Heavy ions 

摘      要：We propose a beam-dump experiment (BDE) at the upcoming facility of China initiative Accelerator Driven System (CiADS), called CiADS-BDE, in order to search for long-lived particles (LLPs) predicted in various beyond-the-Standard-Model (BSM) theories. The experiment is to be located in the forward direction of the incoming low-energy proton beam at CiADS, leveraging the strong forward boost of the produced particles at the beam dump in general. The space between the dump and the detector is largely available, allowing for installation of veto materials and hence low levels of background events. We elaborate on the detector setup, and choose dark photon as a benchmark model for sensitivity study. We restrict ourselves to the signature of an electron-positron pair, and find that with 5 years’ operation, unique, currently unexcluded parts of the parameter space for O(100) MeV dark-photon masses and O(10−9–10−8) kinetic mixing can be probed at the CiADS-BDE. Furthermore, considering that there is no need to set up a proton beam specifically for this experiment and that the detector system requires minimal instrumentation, the experiment is supposed to be relatively cost-effective. Therefore, we intend this work to promote studies on the sensitivity reach of the proposed experiment to additional LLP scenarios, and in the end, the realization of the experiment. Incidentally, we study the sensitivity of the same BDE setups at the High Intensity Heavy-ion Accelerator Facility (HIAF), presently under construction near the CiADS program site, and conclude that HIAF-BDE could probe new parameter regions, too. © 2024, CC BY.