Correcting the Energy Scale Nonlinearity of the Electromagnetic Calorimeter by Two-Photon Decays of a π~0 Meson

摘要

A method for correcting the nonlinearity of the electromagnetic calorimeter response is described. This method is based on minimizing the deviation of the measured mass of a neutral π~0 meson decaying into two photons, depending on their energy. This method has been developed for the LGD2 electromagnetic calorimeter and used in the Hyperon-M experiment at the U-70 accelerator of the Institute for High Energy Physics. The proposed correction technique has made it possible to substantially reduce variations of the reconstructed π~0 and η meson masses in accordance with their minimum energies.