The 2023 international workshop on the high energy Circular Electron-Positron Collider (CEPC) was successfully held in Nanjing from October 23 to 27. There are about 300 participants from more than 100 institutions worldwide, with 59 attendees from outside of China. The conference was co-organized by Nanjing University and the Institute of High Energy Physics (IHEP), CAS. Professor Shan Jin from Nanjing University and Professor Jianchun Wang from IHEP served as co-chairs of the conference. Dean Bogen Wang from the School of Physics at Nanjing University presided over the opening ceremony.
The standard model theory, established over more than half a century, has successfully explained almost all experimental phenomena. However, there are still many mysteries in particle physics, such as the dark matter, the origin of neutrino mass and the generation of antimatter in the universe. The Large Hadron Collider discovered the Higgs in 2012 through proton-proton collisions. Precisely study of the Higgs is crucial for understanding these mysteries. However, the high level of background in proton-proton collision makes it hard to accurately study the properties of Higgs. It can improve the measurement precision to a level of 0.1% ~ 1% by studying the Higgs generated from e+e- collision. It is widely agreed that the construction of an e+e- collider with high energy is essential for the development of particle physics.
The symposium was divided into several parts, including plenary sessions, parallel sessions and a poster presentation. There are 251 oral presentations during the 5-day conference, covering diverse topics such as Higgs physics, accelerators, detectors, software, electronics and CEPC industry-university-research consortium (CIPC). During the plenary session, Professor Michael Ramsey-Musolf, from the University of Massachusetts, Amherst, gave a report titled "Physics at future electron positron colliders". He introduced the international cooperation and the construction of the next generation high-energy/high-luminosity e+e- collider. Then Professor Yuhui Li, the deputy director of IHEP, gave a presentaion about the overview of the recent research progress and the next steps in the planning for the CEPC. Last, the invited experts from both domestic and international institutions gave reports on the research progress and development status of several large-scale high-energy e+e- colliders and Higgs (Z/W) factories. These projects are currently being actively promoted or undergoing feasibility pre-research, such as the Future Circular Collider (FCC) in Europe, the International Linear Collider (ILC/CLIC), the International Muon Collider, and the ECAF detector. The latest research achievements of many young scholars are also presented in the form of posters, focusing on aspects such as hardware, software and algorithms related to accelerators and detectors.
Attendees expressed full recognition for the work and progress made in the CEPC project, emphasizing the importance and necessity of constructing CEPC in promoting the development of particle physics. Additionally, both domestic and international experts and scholars expressed a desire to strengthen cooperation and exchange.
During the symposium, Academician Yifang wang, the director of IHEP, gave a talk titled "The Future of High Energy Physics - Opportunities and Challenges for China", which is tailored for undergraduate and graduate students. He provided a detailed overview of the historical development, current situation and prospects in the field of high-energy physics. He also pointed out the opportunities and challenges faced in this field. He encouraged students to explore bravely and cratively in this field. Following the presentation, young scholars Engaged in discussions with Academician Yifang wang enthusiastically.