CMS HCAL Testbeam Results and Comparison with GEANT 4 Simulation

A study of the CMS hadron calorimeter has been performed using pions, protons, electrons, and muons in the H2 test beam in the North Area at CERN in 2004. We present some of the measured properties of the HCAL barrel calorimeter. These include the detector energy resolution, linearity, and longitudinal shower profile as a function of the incident particle momentum. The detector configuration that was used included a mock-up of electromagnetic calorimeter (a 7x7 array of PbWO4 crystals) and two hadronic barrel modules . The momentum range of the beam particles was from 5 to 300 GeV/c. A validation of the GEANT4 was done by comparing the predictions of the simulation with the test beam data