Hadronic shower reconstruction in an imaging calorimeter

The hadron energy reconstruction in the CALICE analog scintillator-steel hadronic calorimeter prototype was studied using pion test beam data. The stochastic term contribution to the intrinsic energy resolution was estimated to be ~58%/√E/GeV. Two software compensation techniques were developed based on an event-by-event analysis of the energy density spectra. The application of either local or global software compensation technique results in reducing of stochastic term contribution down to ~45%/√E/GeV. The achieved improvement of hadronic energy resolution is ~20% in the energy range from 10 to 80 GeV. CALICE test beam data were also used to test the particle flow approach. The results of application of the PandoraPFA particle flow algorithm to test beam data and to GEANT4 simulated samples are shown to be in good agreement, supporting the simulation-based estimations made for the full detector system.