Hadronic response and e/(pi) separation with the H1 lead/fibre calorimeter

摘要

Hadronic response and electron identification performance of the new H1 lead-scintillating fibre calorimeter are investigated in the 1 to 7 GeV energy range using data taken at the CERN Proton Synchroton. The energy response to minimum ionizing particles and interacting pions are studied and compared to Monte Carlo simulations. The measured energy of pions interacting either in the electromagnetic or in the hadronic section is found to scale linearly with the incident energy, providing an energy resolution (sigma)/E(proportional to)38% within a depth of one interaction length and (sigma)/E(proportional to)29% for a total depth of two interaction lengths. Several electron identification estimators are studied and combined as a function of energy and impact point. The probability for pions to be misidentified as electrons of any measured energy above 1 GeV ranges from 5% (for 2 GeV incident pions) to 0.4% (at 7 GeV) for an electron detection efficiency of 90%. The proability for pions of a given energy to be misidentified as electrons of the same energy falls to 0.25% at 7 GeV. (orig.)