Calibration of the ALICE Photon Spectromter (PHOS) using the neutral pion to gamma gamma decay
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The Large Hadron Collider (LHC) is under construction beneath the border between Switzerland and France. If it is successful, it will accelerate and collide protons at 7 T eV per proton in center of mass. Furthermore, it will collide lead (Pb) nuclei at 2.76 T eV per nucleon. ALICE is a LHC experiment dedicated to heavy ion physics. It will have two electro-magnetic calorimeters. One of these, the PHOton Spectrometer (PHOS), will provide high precision coverage at mid- rapidity in about 1/3 of the full azimuthal angle. We will go into the details of one of these techniques, calibration using neutral pions (π 0 ). Furthermore, we will present an implementation of this technique and the result of the implementation used on simulated data. Lastly, we will attempt to evaluate the techniques effectiveness.