Correction of the energy scale nonlinearity in electromagnetic calorimeters with the pi0 two-photon decays

TL;DR

This paper presents a method to correct energy scale nonlinearity in electromagnetic calorimeters by minimizing deviations in neutral meson mass measurements, improving accuracy in particle energy reconstruction.

Contribution

The paper introduces a novel correction technique based on neutral meson mass minimization, tailored for the LGD2 calorimeter in the Hyperon-M experiment.

Findings

Significant reduction in mass variation for $C0^0$ and $B5$ mesons.

Enhanced accuracy in energy measurements of decay photons.

Applicable correction method for calorimeter nonlinearity.

Abstract

The method to calculate the non-linearity correction of the electromagnetic calorimeter response, based on minimisation of the deviation of the measured neutral meson mass on the energies of it decay photons, is described in this paper. This method was developed for the electromagnetic calorimeter LGD2 in the Hyperon-M experiment at U70 accelerator of IHEP. The found correction allowed to reduce significantly variations of the reconstructed $\pi^0$ and $\eta$ masses on the minimal energy of the mesons.