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

作　　者：姬长胜 邵明 张辉 陈宏芳 张一飞 

机构地区：[1]University of Science and Technology of China

出　　处：《Chinese Physics C》2013年第4期61-68,共8页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10675111, 10835005)

摘　　要：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.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.

关 键 词：η meson rare decay CSR LANZHOU 

分 类 号：O571.3[理学—粒子物理与原子核物理]