p/πSeparation =+mc/p2-1+mc21p） ID 111 E ntries 378 Mean 6.2象88E-B1 RMS 4.110 红 UDFLW 0. Momentum: OVFLW 0. T80 x/ndf 8T62124 3GeV/c PI 815.8 P2 -1,g19 60 P3 1.490 P4 1T1.5 Flight path length: 7.0B9 P6 1.T32 277cm 4日 8t=432ps 300 (prediction) 20 6t=441ps 100 (experiment) .20 10 20 Tim e (50ps/ch) 2023/6/28 Talk for EM group伍健 72023/6/28 Talk for EM group 伍健 7 Momentum: 3GeV/c Flight path length: 277cm t=432ps （prediction） t=441ps （experiment） ( ) 2 2 2 2 2 2 2 1 1 m c / p 1 m c / p c L t  + − +       = p/ Separation