Particle Identification with Pulse Amplitude of TOF Counter

Time of flight counter (TOF) is one of the main subdetectors of Beijing Spectrometer II (BES II) for identification of charge particles. Time of flight and pulse amplitude are measured from the time of flight counters, when the particle hits on the TOF. Based on Di-mu sample from BES the correction of pulse amplitude Q is studied. Using the hadron sample of J/phi, the relation between the corrected Pulse amplitude and beta gamma value is analyzed. A conclusion is that it is feasible to use the pulse amplitude Q(0) of TOF to identify the particles. Finally the particle;identification and mis-identification rate are given when the pulse amplitude is used to identify the particles.