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Production and constraints for a massive dark photon at electron-positron colliders

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Chinese Physics C 2020年第2期44卷 62-71页

作者： Jun Jiang Chun-Yuan Li Shi-Yuan Li Shankar Dayal Pathak Zong-Guo Si Xing-Hua Yang School of Physics Shandong UniversityJinanShandong 250100China Department of Physics Lovely Professional UniversityPhagwaraPunjab144411India

dark sector may couple to the Standard Model via one or more mediator *** discuss two types of mediators:the dark photon A’ and the dark scalar mediator Φ .The total cross-sections and various differential distributions of the processes e+e-→qqA’ and e+e→qqφ（q=u,d,c,s and b quarks） are *** focus on the study of the invisible due to the cleaner background at future e+*** is found that the kinematic distributions of the two-jet system could be used to identify（or exclude） the dark photon and the dark scalar mediator,as well as to distinguish between *** further study the possibility of a search for dark photons at a future CEPC experiment with s1/2=91.2 GeV and 240 *** CEPC running at s1/2=91.2 GeV,it would be possible to perform a decisive measurement of the dark photon（20 GeV

关键词： dark photon dark scalar mediator CEPC

Application of superconducting cavity tuner in dark photon dark matter search

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Radiation Detection Technology and Methods 2024年第3期8卷 1390-1396页

作者： Ming Liu Zhenghui Mi Peng Sha Weimin Pan Jing Shu Zhenxing Tang Chunlong Li Feisi He Lingxi Ye Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Beijing100049China Key Laboratory of Particle Accelerator Physics and Technology Chinese Academy of SciencesBeijing100049China School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking UniversityBeijing100871China Center for High Energy Physics Peking UniversityBeijing100871China Beijing Laser Acceleration Innovation Center HuairouBeijing101400China Institute of Heavy Ion Physics Peking UniversityBeijing100871China

Purpose In order to precisely control the resonant frequency of RF superconducting cavity to detect dark photon dark matter,and to be able to tune within a certain frequency range,it is necessary to design a low-temperature tuner for frequency control on the bare *** Two type mechanical tuners have been designed for the 1.3 GHz single-cell bare cavity and 650 MHz single cell bare *** tuner device tunes the frequency of RF superconducting cavity for the detection of dark photons and dark matter and measures its tuning range and accuracy in both room-temperature and low-temperature *** The tuner for the 1.3 GHz cavity has a tuning accuracy of 1 Hz per step and a tuning range of 1.37 MHz at low *** tuner for the 650 MHz cavity has a tuning range of 467 kHz at low temperatures,with a tuning accuracy of 1.77 Hz per *** The designed tuner can meet the requirements of RF superconducting cavity tuning for detecting dark photons and dark matter,and its adjustable range,precision and stability ensure that the detection experiment can be carried out smoothly.

关键词： Superconducting cavity Tuner dark photon dark matter

Estimating the production of dark photons with η decay in high-energy collisions

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Chinese Physics C 2024年第10期48卷 150-156页

作者： Wei Kou Xurong Chen Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Southern Center for Nuclear Science Theory Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

We propose searching for dark photon signals in the decay channel of η mesons,specifically through the leptonic decay(A'→e^(+)e^(-)(μ^(+)μ^(-)))observable in photon-photon interactions during ultra-peripheral heavy-ion *** estimate the total cross-section for dark photon production in ultra-peripheral PbPb collisions at current and future hadron *** findings support the potential for detecting dark photon signals at the LHC,HighLuminosity LHC,High-Energy LHC,and Future Circular Collider.

关键词： dark photon ηdecay ultra-peripheral collision lead-lead collision

Design of hadronic calorimeter for darkSHINE experiment

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Nuclear Science and Techniques 2024年第9期35卷 155-167页

作者： Zhen Wang Rui Yuan Han-Qing Liu Jing Chen Xiang Chen Kim Siang Khaw Liang Li Shu Li Kun Liu Qi-Bin Liu Si-Yuan Song Tong Sun Xiao-Long Wang Yu-Feng Wang Hai-Jun Yang Jun-Hua Zhang Yu-Lei Zhang Zhi-Yu Zhao Chun-Xiang Zhu Xu-Liang Zhu Yi-Fan Zhu Tsung-Dao Lee Institute Shanghai Jiao Tong University1 Lisuo RoadShanghai 201210China Institute of Nuclear and Particle Physics School of Physics and Astronomy800 Dongchuan RoadShanghai 200240China Key Laboratory for Particle Astrophysics and Cosmology(MOE) Shanghai Key Laboratory for Particle Physics and Cosmology(SKLPPC)Shanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200443China Institute of Modern Physics Fudan UniversityShanghai 200443China

The sensitivity of the dark photon search through invisible decay final states in low-background experiments relies sig-nificantly on the neutron and muon veto efficiencies,which depend on the amount of material used and the design of the detector *** paper presents the optimized design of the hadronic calorimeter(HCAL)used in the darkSHINE experiment,which is studied using a GEANT4-based simulation *** geometry is optimized by comparing a traditional design with uniform absorbers to one that uses different thicknesses at different locations on the detector,which enhances the efficiency of vetoing low-energy neutrons at the sub-GeV *** overall size and total amount of material used in the HCAL are optimized to be lower,owing to the load and budget requirements,whereas the overall performance is studied to satisfy the physical objectives.

关键词： Hadronic calorimeter GEANT4 simulation Neutron background Scintillation detector dark photon

Prospective study of light dark matter search with a newly proposed darkSHINE experiment

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Science China(Physics,Mechanics & Astronomy) 2023年第1期66卷 124-138页

作者： Jing Chen Ji-Yuan Chen Jun-Feng Chen Xiang Chen Chang-Bo Fu Jun Guo Le He Zheng-Ting He Kim Siang Khaw Jia-Lin Li Liang Li Shu Li Meng Lv Dan-Ning Liu Han-Qing Liu Kun Liu Qi-Bin Liu Yang Liu Ze-Jia Lu Cen Mo Si-Yuan Song Xiao-Long Wang Yu-Feng Wang Zhen Wang Zi-Rui Wang Wei-Hao Wu Dao Xiang Hai-Jun Yang Jun-Hua Zhang Yu-Lei Zhang Zhi-Yu Zhao Xu-Liang Zhu Chun-Xiang Zhu Yi-Fan Zhu Tsung-DaoLee Institute Shanghai Jiao Tong UniversityShanghai 201210China Institute of Nuclear and Particle Physics School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory for Particle Astrophysics and Cosmology(MOE) Shanghai Key Laboratory for Particle Physics and Cosmology(SKLPPC)Shanghai 200240China Center for High Energy Physics Peking UniversityBeijing 10087lChina School of Mechanical and Electronic Engineering Suzhou UniversitySuzhou 234000China School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China School of Electronics Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China R&D Center Shanghai Instituteof CeramicsChinese Academyof SciencesShanghai 20189China Key Laboratory of Nuclear Physics and lon-beam Application(MOE) Fudan UniversityShanghai 200443China Institute of Modern Physics Fudan UniversityShanghai 200443China IKey Laboratory for Laser Plasmas(MOE) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Zhangjiang Institute for Advanced Study Shanghai JiaoTong UniversityShanghai 200240.China College of Literature Scienceand the ArtsUniversity of MichiganAnn Arbor MI 48109-1040USA Deparment of Physics Swiss Federal Institnute of Technology ZurichZurich 8093Swizerland

dark photons have been well motivated as strong candidates for dark force carriers and light dark matter in the sub-GeV mass *** with collider experiments,fixed-target experiments provide a complementary approach to searching for dark photons,particularly in the lower mass *** have studied the physics potential of the electron-on-target experiment based on the Shanghai SHINE facility,which provides 10 MHz single electron beam at 8 GeV *** analysis focuses on dark photons being produced via electron and nucleon interaction and then decays to dark matter candidates,which escape detection as missing momentum in the *** experiment takes advantage of using missing momentum to enhance signal versus background separation *** this study,signal samples as a function of dark photon mass and an inclusive background sample with 2.5 billion events are simulated with *** better background estimates,major rare background processes have also been *** paper presents the experiment and detector design,signal and background simulations,analysis strategy,and the prospective study of the experiment *** 9×10^(14) electron-on-target events(about three years running),this experiment is expected to rule out most of the sensitive regions predicted by popular dark photon models.

关键词： dark matter dark photon electron-on-target experiment

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

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Frontiers of physics 2016年第5期11卷 9-22页

作者： Peng-Fei Yin Shou-Hua Zhu 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

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.

关键词： dark photon electron-positron collider dark matter

Unconventional dark matter models: a brief review

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Science Bulletin 2015年第11期60卷 986-994,I0007页

作者：张毅赵悦 Department of Physics and Astronomy NHETC Rutgers University Department of Physics Stanford Institute for Theoretical Physics Stanford University

Although weakly interacting massive particle （WIMP） scenario is very well motivated, it is not guaran- teed to be the truth. It is important to keep mind open and consider other well-motivated scenarios. In this paper, we briefly review several possible non-WIMP dark matter （DM） candidates. First, we discuss details on asymmetric DM models, in which the baryon asymmetry in standard model sector is related to the asymmetry in DM sector. We discuss how DM relic abundance is determined in such models. Also we cover the possible interesting ex- perimental signatures induced by its asymmetric nature. Then we consider ultralight DM candidates, i.e., axion and dark photon. In such scenarios, DM should be treated as a coherently oscillating background, instead of each individual particle. Searching strategies for such DM candidates is very different than those in conventional DM models. We discuss several interesting experiments looking for these ultralight particles. We also cover interesting subtleties encountered in those experiments.

关键词： dark matter model Weakly interacting massive particle (WIMP) Ultralight DM candidates Standard model Axion dark photon