Study of the tracking efficiency of charged pions at BESIII

Fang Liu, Xiao-Bin Ji, Sheng-Sen Sun +11

Using $(10087\pm 44)\times 10^6$ $J/\ddot{I}ˆ$ events collected with the BESIII detector in 2009, 2012, 2018 and 2019, the tracking efficiency of charged pions is studied using the deca…