Super Tau-Charm Facility of China

The tau-charm region is one of the most important energy regions in the research of particle physics due to its unique properties, rich frontier topics and great potential for scientific discovery. In order to maintain our country's pioneering position in the tau-charm research field, we propose to build a new generation electron-positron collider—the Super Tau-Charm Facility (STCF), based on the Hefei National Synchrotron Radiation Laboratory, the State Key Laboratory of Particle Detection and Electronics, and other research platforms. The STCF would have a luminosity greater than 0.5×10³⁵ cm^-2 s^-1, and a center-of-mass energy region of 2 to 7 GeV. Its performance is expected to be significantly better than the currently running BEPCII, and will provide a key 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 the quest for exotic particles and physics beyond the standard model. The construction of STCF poses a great challenge to the existing accelerator and detector technologies in China, but is very important scientifically and strategically not only for fundamental scientific research but also for the development of new technology and the cultivation of comprehensive expertise.