STCF conceptual design report (Volume 1): Physics & detector

Abstract

The super τ-charm facility (STCF) is an electron−positron collider proposed by the Chinese particle physics community. It is designed to operate in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of 0.5 × 10³⁵ cm⁻²·s⁻¹ or higher. The STCF will produce a data sample about a factor of 100 larger than that of the present τ-charm factory — the BEPCII, providing a unique platform for exploring the asymmetry of matter-antimatter (charge-parity violation), in-depth studies of the internal structure of hadrons and the nature of non-perturbative strong interactions, as well as searching for exotic hadrons and physics beyond the Standard Model. The STCF project in China is under development with an extensive R&D program. This document presents the physics opportunities at the STCF, describes conceptual designs of the STCF detector system, and discusses future plans for detector R&D and physics case studies.

Graphical abstract

Keywords

electron−positron collider / tau-charm region / high luminosity / STCF detector / conceptual design

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Declarations

The authors declare that they have no competing interests and there are no conflicts.

Acknowledgements

We would like to thank Sergey Barsuk (IN2P3-CNRS & Université Paris 11, France), Alexander Bonder (Novosibirsk State University & Budker Institute of Nuclear Physics, Russia), Oliver Callot (IN2P3/CNRS & Université Paris 11, France), Wolfgang Kühn (Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Germany), Cheng Li (University of Science and Technology of China, China), Jin Li (Institute of High Energy Physics, China), Weiguo Li (Institute of High Energy Physics, China), Alexey Petrov (University of South Carolina, USA), Yuri Tikhonov (Budker Institute of Nuclear Physics, Russia), and Changzheng Yuan (Institute of High Energy Physics, China; University of Chinese Academy of Sciences, China) for their reviewing of this report. We would like to thank Andrzej Kupsc (National Centre for Nuclear Research, Poland; Uppsala University, Sweden) for his contribution to this report. We thank the University of Science and Technology of China, the Hefei Comprehensive National Science Center, State Key Laboratory of Particle Detection and Electronics, and National Synchrotron Radiation Laboratory for their strong support. The research work leading to this report was supported by the National Key R&D Program of China under Contract No. 2022YFA1602200, the International Partnership Program of the Chineses Academy of Sciences under Grant No. 211134KYSB20200057 and the STCF Key Technology Research and Development Project.

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