Hadronic energy resolution of a highly granular scintillator-steel hadron calorimeter using software compensation techniques

Abstract

The energy resolution of a highly granular 1 m3 analogue scintillator-steel\nhadronic calorimeter is studied using charged pions with energies from 10 GeV\nto 80 GeV at the CERN SPS. The energy resolution for single hadrons is\ndetermined to be approximately 58%/sqrt(E/GeV}. This resolution is improved to\napproximately 45%/sqrt(E/GeV) with software compensation techniques. These\ntechniques take advantage of the event-by-event information about the\nsubstructure of hadronic showers which is provided by the imaging capabilities\nof the calorimeter. The energy reconstruction is improved either with\ncorrections based on the local energy density or by applying a single\ncorrection factor to the event energy sum derived from a global measure of the\nshower energy density. The application of the compensation algorithms to Geant4\nsimulations yield resolution improvements comparable to those observed for real\ndata.\n