Speaker
Description
The MEG II experiment in a search of $\mu\to\mathrm{e}\gamma$ started taking physics data in 2021. A liquid xenon calorimeter with 4760 photosensors measures photon position, time, and energy of 52.8 MeV. The precise energy reconstruction to distinguish signal and background events requires the calibration of photosensors and an energy scale of the calorimeter. The energy resolution of 1.8% was achieved and the uncertainty of the energy scale was suppressed to 0.4% in 2021. In addition, pileup elimination algorithms have been developed since a high-intensity muon beam of $3-5 \times 10^{7}\,\mathrm{Hz}$ is stopped at the muon stopping target. A single photon energy is reconstructed by the algorithms. Currently, the analysis of the 2022 data is in progress. This presentation describes the reconstruction algorithm, the calibration, and the achieved performance with the 2021 and 2022 combined datasets.
