We study the possibility of searching the η→e＋e- rare decay on the Cooling Storage Ring （CSR） at Lanzhou. The main features of the proposed Internal Target Experiment （ITE） and External Target Facility （ETF） ...We study the possibility of searching the η→e＋e- rare decay on the Cooling Storage Ring （CSR） at Lanzhou. The main features of the proposed Internal Target Experiment （ITE） and External Target Facility （ETF） are included in the Monte Carlo simulation. Both the beam condition at the CSR and the major physics backgrounds are carefully taken into account. We conclude that the ITE is more suitable for such a study due to better detector acceptance and higher beam density. At the maximum designed luminosity （1034cm-2s-1 ）, η→e＋e- events can be collected every～400 seconds at the CSR. With a mass resolution of 1 MeV, the expected signal-to-background （S/B） ratio is around 1.展开更多
基金Supported by National Natural Science Foundation of China (10675111, 10835005)
文摘We study the possibility of searching the η→e＋e- rare decay on the Cooling Storage Ring （CSR） at Lanzhou. The main features of the proposed Internal Target Experiment （ITE） and External Target Facility （ETF） are included in the Monte Carlo simulation. Both the beam condition at the CSR and the major physics backgrounds are carefully taken into account. We conclude that the ITE is more suitable for such a study due to better detector acceptance and higher beam density. At the maximum designed luminosity （1034cm-2s-1 ）, η→e＋e- events can be collected every～400 seconds at the CSR. With a mass resolution of 1 MeV, the expected signal-to-background （S/B） ratio is around 1.
