Note: Work in Progress !!

1. Introduction
2. Principle of a dual read out calorimeter
3. The ccal02 detector
4. Available data sets

Introduction

Principle of a dual read out calorimeter

The response of a calorimeter is very different for  e+, e- and  photons  compared to hadrons. For e+, e- and  photons the total energy of the incoming particle is converted into detectable kinetic energy of electrons leading to excellent energy resolution for electrons/photons. Hadrons  on the other hand break nuclei and liberate nucleons/nuclear fragments. Even if the kinetic energy of the resulting nucleons is measured, the significant fraction of energy is lost to overcome the binding energy. Fluctuations of the number of broken nuclei dominate fluctuations of the observed energy leading to a relatively poor energy resolution for hadrons.This is demonstrated in the figure below where the ionization loss of a 10 GeV Pion is compared with the ionization loss of a 10 GeV electron. In both cases we use a simple Iron block as an absorber that contains the entire shower.

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