Huizhou Hadron Spectrometer: a proposed high-rate experimental setup at the high–intensity heavy-ion accelerator facility
摘要
The high-intensity heavy-ion accelerator facility (HIAF), currently under construction in Huizhou, Guangdong Province, China, is expected to be completed by 2025. This facility will be capable of delivering proton and heavy-ion beams with energies of up to several GeV, thereby providing a versatile platform for advanced fundamental physics research. Key scientific objectives include exploring physics beyond the standard model through the search for new particles and interactions, testing fundamental symmetries, investigating exotic hadronic states such as dibaryons, pentaquark states, and multi-strange hypernuclei, conducting precise measurements of hadron and hypernucleus properties, and probing the phase boundary and the critical point of nuclear matter. To facilitate these investigations, we propose the construction of a dedicated experimental apparatus at HIAF—the Huizhou Hadron Spectrometer (HHaS). This paper presents the conceptual design of HHaS, which comprises a solenoid magnet, a five-dimensional silicon pixel tracker, a Low-Gain Avalanche Detector (LGAD) for time-of-flight measurements, and a Cherenkov–scintillation dual-readout electromagnetic calorimeter. The design targets an unprecedented event rate of 1–100 MHz, extensive particle acceptance, a track momentum resolution at the 1% level, an electromagnetic energy resolution of