1. Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China 2. IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France 3. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China 4. University of Chinese Academy of Sciences, Beijing 100049, China 5. Nankai University, Tianjin 300071, China 6. Xinyang Normal University, Xinyang 464000, China 7. School of Physics and Materials Science, Guangzhou University, Guangzhou 510006, China 8. Hunan University, Changsha 410082, China 9. Nanjing University, Nanjing 210093, China 10. Huazhong University of Science and Technology, Wuhan 430074, China 11. European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*) and Fondazione Bruno Kessler, Villa Tambosi, Strada delle Tabarelle 286, I-38123 Villazzano (TN), Italy 12. School of Physics, Peking University, Beijing 100871, China 13. Hunan Normal University, Changsha 410081, China 14. Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China 15. Nanjing Normal University, Nanjing 210023, China 16. Department of Physics, College of Sciences, Northeastern University, Shenyang 110819, China 17. Southwest Jiaotong University, Chengdu 610000, China 18. Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32, 10000 Zagreb, Croatia 19. Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna 141980, Russia 20. School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China 21. Lanzhou University, Lanzhou 730000, China 22. Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Qingdao 266237, China 23. Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China 24. School of Physics, Southeast University, Nanjing 211189, China 25. Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai 200433, China 26. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China 27. Department of Physics, Chongqing University, Chongqing 401331, China 28. Department of Physics and Astronomy, Vrije Universiteit Amsterdam, De Boelelaan 1081 1081HV Amsterdam, The Netherlands 29. Nikhef Theory Group Science Park 105, 1098 XG Amsterdam, The Netherlands 30. Department of Nuclear Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China 31. Dalian University of Technology, Dalian 116024, China 32. National Centre for Nuclear Research (NCBJ), Pasteura 7, 02-093 Warsaw, Poland 33. School of Physics, Beihang University, Beijing 100191, China 34. Shanghai Jiao Tong University, Shanghai 200240, China 35. Lanzhou University of Technology, Lanzhou 730050, China 36. University of Science and Technology of China, Hefei 230026, China 37. School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen 518172, China 38. School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China 39. Huangshan University, Huangshan 245021, China 40. School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China 41. Tsinghua University, Beijing 100084, China 42. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA 43. Center of Advanced Quantum Studies, Department of Physics, Beijing Normal University, Beijing 100875, China 44. School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, China 45. School of Physics and Technology, Wuhan University, Wuhan 430072, China 46. Institute of High Energy Physics and Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, Beijing 100049, China 47. School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, China
Lepton scattering is an established ideal tool for studying inner structure of small particles such as nucleons as well as nuclei. As a future high energy nuclear physics project, an Electron-ion collider in China (EicC) has been proposed. It will be constructed based on an upgraded heavy-ion accelerator, High Intensity heavy-ion Accelerator Facility (HIAF) which is currently under construction, together with a new electron ring. The proposed collider will provide highly polarized electrons (with a po- larization of 80%) and protons (with a polarization of 70%) with variable center of mass energies from 15 to 20 GeV and the luminosity of (2–3)×1033 cm−2•s−1. Polarized deuterons and Helium-3, as well as unpolarized ion beams from Carbon to Uranium, will be also available at the EicC.
The main foci of the EicC will be precision measurements of the structure of the nucleon in the sea quark region, including 3D tomography of nucleon; the partonic structure of nuclei and the parton interaction with the nuclear environment; the exotic states, especially those with heavy flavor quark contents. In addition, issues fundamental to understanding the origin of mass could be addressed by measurements of heavy quarkonia near-threshold production at the EicC. In order to achieve the above-mentioned physics goals, a hermetical detector system will be constructed with cutting-edge technologies.
This document is the result of collective contributions and valuable inputs from experts across the globe. The EicC physics program complements the ongoing scientific programs at the Jefferson Laboratory and the future EIC project in the United States. The success of this project will also advance both nuclear and particle physics as well as accelerator and detector technology in China.
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