Analogue, Digital and Semi-Digital Energy Reconstruction in the CALICE AHCAL

Within the CALICE collaboration different calorimeter technologies are studied for a future linear collider. These technologies differ in active material, ganularity and readout systems. The Analog Hadronic Calorimeter (AHCAL) reads out the signal proportional to the energy deposition in each calorimeter cell, while the digital HCAL detects hits by firing RPC pad sensors above a certain threshold. A 3 bit readout is provided by the semi-digital HCAL, which counts hits above three different thresholds per cell. For these three options different energy reconstruction procedures are developed. The analog data can also provide digital information, thus the advantages and disadvantages of different energy reconstruction procedures can be studied. In this work such a comparison is done by applying these procedures to AHCAL beam test data, collected with the 1m3 physics prototype at CERN, and simulated data, generated with GEANT4.