Calibration Studies and the Investigation of Track Segments within Showers with an Imaging Hadronic Calorimeter

TL;DR

This paper presents a highly granular calorimeter prototype capable of detailed shower substructure analysis, enabling improved calibration and validation of hadronic shower models through both experimental data and simulations.

Contribution

It introduces a novel imaging calorimeter with track segment identification for calibration and model validation, advancing detector technology and analysis methods.

Findings

Track segments are of high quality for calibration.

Calibration constants can be transferred between different experimental setups.

The detector's imaging capability constrains hadronic shower models.

Abstract

The CALICE collaboration has constructed a highly granular hadronic sampling calorimeter prototype with small scintillator tiles individually read out by silicon photomultipliers (SiPM) to evaluate technologies for the ILC. The imaging capability of the detector allows detailed studies of the substructure of hadronic events, such as the identification of minimum ionizing track segments within the hadronic shower. These track segments are of high quality, so that they can be used for calibration, as an additional tool to Muons and to the built-in LED system used to monitor the SiPMs. These track segments also help to constrain hadronic shower models used in Geant4. Detailed MC studies with a realistic model of an ILC detector were performed to study the calibration requirements of a complete calorimeter system. The calibration strategy was tested on real data by transporting calibration constants from a Fermilab beam test to data recorded at CERN under different conditions.