Muonium to Antimuonium Conversion Search Using A LGAD-Based Detector System: A Simulation Study

摘要: The muonium to antimuonium conversion research would be enhanced by an intense pulsed muon source. However, the high intensity muon source induces high pile-up rate in the detector system and reduces the total efficiency. Here we propose a Low Gain Avalanche Detector (LGAD)-based system to search for the muonium to antimuonium conversion process. We design and simulate the detector system, taking into account the LGADs' dead time to evaluate pulse pile-up induced efficiency loss of signal events under various beam intensities. The upper limit on the conversion probability with respect to beam intensity has been assessed. The results indicate that at a muon beam intensity of 106 μ+/pulse, the upper limit of the conversion probability can reach 4.67×10-12(at 90% C.L.) with about 32.97% total efficiency. The sensitivity of the experiment increases with beam intensity, despite reduced detection efficiency due to pile-up. When the beam intensity reach up to 108 μ+/pulse, the sensitivity can achieve 5.93×10-14(at 90% C.L.), while the efficiency of the detector start to decrease rapidly.