Testing Cosmic Ray Generators on ECal/MPD Data

Abstract—One of the important subsystems of the MPD experiment is the cylindrical electromagnetic calorimeter ECal, consisting of 50 half-sectors, each of which has 768 cells (towers) of different types and spatial orientations. To calibrate the half-sector towers using cosmic ray muons, a technique was developed that is applicable to its horizontal arrangement. However, in a fully assembled calorimeter, the half-sectors are located on the surface of a horizontal cylinder in different positions relative to the vertical. In this paper, the effect of rotation of half-sector on calibration coefficients is presented for both experimental data and simulations. It is shown that the simulation based on modern parameterizations of the cosmic-ray muon flux is in good agreement with the experimental data. The influence of the angular distribution of the muon flux on the calibration accuracy is discussed.