Prospects for searching the η→e<SUP>+</SUP>e<SUP>-</SUP> rare decay at the CSR

JI Chang-Sheng; SHAO Ming; ZHANG Hui; CHEN Hong-Fang; ZHANG Yi-Fei

doi:10.1088/1674-1137/37/4/046201

Chinese Physics C> 2013, Vol. 37> Issue(4) : 046201 DOI: 10.1088/1674-1137/37/4/046201

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

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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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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

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Received: 2012-09-13
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Corresponding author: SHAO Ming,

Received Date: 2012-09-13

Accepted Date: 1900-01-01

Available Online: 2013-04-05

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

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

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