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The high granularity of the ARGUS shower counter system allows one to determine the lateral energy deposition. An algorithm based on the number of shower counters set by an incoming particle, the amount of energy deposited in the shower counters and the lateral distribution of the energy allows to separate electrons from muons and hadrons. For electrons with momenta larger than 0.7 GeV/c the hadron rejection rate is of the order of 50 at an electron detection efficiency of 80%.

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The e+e -storage ring DORIS II provides polarized beams with polarizations up to 80% in the energy range of the T' meson. The method of resonance depolarization allows the average beam energy to be determined to a precision of ± 0.1 Mel/. An energy scan of the hadronic cross section over the resonance range with the detectors ARGUS and Crystal Ball determines the T ' mass to be (10023.1 ± 0.4 ± 0.3) MeU.