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介绍了BESIII电磁量能器(EMC)位置重建及其修正的研究工作。利用蒙特卡罗模拟(MC)单电子和单光子分别对θ向和向进行修正,修正参数考虑了能量和位置依赖;对于真实数据,θ向位置修正量与MC修正量有微小差异,在MC修正的基础上,利用Bhabha数据确定真实数据的二次修正参数。利用Bhabha事例和双光子事例检验EMC位置重建性能,MC模拟与真实数据位置分辨基本一致,动量为1 GeV的电子在θ向位置分辨达到5.6 mm,达到了BESIII EMC的设计指标。
The research work of BESIII electromagnetic energy location (EMC) reconstruction and its correction was introduced. Θ and directions are corrected by Monte Carlo simulation (MC) single electron and single photon, respectively. The correction parameters take into account the energy and position dependence. For the real data, there is a slight difference between the θ position correction and the MC correction. MC correction based on the use of Bhabha data to determine the real data of the secondary correction parameters. Using the Bhabha case and the two-photon case to test the EMC reconstruction performance, the MC simulation is basically the same as the real data. The momentum of 1 GeV electron reaches 5.6 mm at θ position, which meets the BESIII EMC design criteria.