Research demonstrates effective photon identification in high-energy collisions, indicating improved detector performance.
The ALICE experiment at the LHC identifies photons, electrons and neutral mesons with the electromagnetic calorimeters PHOS and EMCal. At high transverse momentum the π^0 decays into two photons with a small aperture angle in the lab system, what makes difficult their identification as separated photons in the calorimeters. One of the proposed methods to discriminate between photons and high momentum π^0 is to study the shape of the shower produced in the calorimeter. In this note we present our results for shower shape MC studies using EMCal. We identify photons with an efficiency higher than the 80% for photons with energies in the range 10-25 GeV.
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Conesa et al. (2011) studied this question.
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