Prospects for searching the η→e+e- rare decay at the CSR

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JI Chang-Sheng, SHAO Ming, ZHANG Hui, CHEN Hong-Fang and ZHANG Yi-Fei. Prospects for searching the η→e+e- rare decay at the CSR[J]. Chinese Physics C, 2013, 37(4): 046201. doi: 10.1088/1674-1137/37/4/046201
JI Chang-Sheng, SHAO Ming, ZHANG Hui, CHEN Hong-Fang and ZHANG Yi-Fei. Prospects for searching the η→e+e- rare decay at the CSR[J]. Chinese Physics C, 2013, 37(4): 046201.  doi: 10.1088/1674-1137/37/4/046201 shu
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Received: 2012-09-13
Revised: 1900-01-01
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Prospects for searching the η→e+e- rare decay at the CSR

    Corresponding author: SHAO Ming,

Abstract: 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 (1034 cm-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.

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