Hadron Energy Resolution of the CALICE AHCAL and Software Compensation Approaches

TL;DR

This paper evaluates the hadron energy resolution of a highly granular calorimeter and introduces software compensation methods that improve resolution by approximately 20% across 10 to 80 GeV energies.

Contribution

The paper presents novel local and global software compensation techniques leveraging high granularity to enhance calorimeter energy resolution.

Findings

Stochastic term reduced to 45%/sqrt(E/GeV) with compensation

Energy resolution improved by about 20% for pions

Resolution achieved across 10-80 GeV energy range

Abstract

The hadron energy resolution of a highly granular CALICE analogue scintillator-steel hadronic calorimeter was studied using pion test beam data. The stochastic term contribution to the energy resolution was estimated to be 58%/sqrt(E/GeV). To improve an energy resolution, local and global software compensation techniques were developed which exploit an unprecedented granularity of the calorimeter and are based on 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%/sqrt(E/GeV). The achieved improvement of single particle energy resolution for pions is about 20% in the energy range from 10 to 80 GeV.