Electron identification using the TOPAZ detector at TRISTAN

TL;DR

This paper introduces an electron-identification method using the TOPAZ detector's time-projection chamber and lead-glass calorimeter, achieving high pion-rejection and electron efficiency across various processes and momentum ranges.

Contribution

The paper presents a novel electron-identification technique combining TPC and calorimeter data, with demonstrated high rejection factors and efficiencies in different collision processes.

Findings

Achieved pion-rejection factors up to 8600.

Electron efficiencies up to 68.4%.

Effective over wide momentum range.

Abstract

We present an electron-identification method using the time-projection chamber and the lead-glass calorimeter in the TOPAZ detector system. Using this method we have achieved good electron identification against hadron backgrounds over a wide momentum range in the hadronic events produced by both single-photon exchange and two-photon processes. Pion-rejection factors and electron efficiencies were 163 and 68.4\% for high-$P_T$ electrons and 137 and 42.7\% for low-$P_T$ electrons in the single-photon-exchange process, and 8600 and 36.0\% for the two-photon process, respectively.