The precise calibration of an electromagnetic calorimeter is extremely important for flavor tagging and for the study of B-mesons decays and therefore is of great importance for implementing the physics program of the LHCb experiment. The purpose of the calibration process is to achieve a 2% accuracy when measuring the energies of electrons and photons. At the last step of a multi-stage procedure, the method of restoring the invariant mass of a neutral pion in its decay into two photons is used.
$^1$Institute of Theoretical and Experimental Physics, ul. Bol’shaya Cheremushkinskaya 25, Moscow, Russia, 117218
$^2$Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, Russia
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