The MEG II experiment searches for a charged-lepton-flavour-violating μ→eγ with the target sensitivity of 6×10−14. A liquid xenon calorimeter with VUV-sensitive photosensors measures photon position, timing, and energy. This paper concentrates on the precise photon energy reconstruction with the MEG II liquid xenon calorimeter. Since a muon beam rate is 3-5×107s−1, multi-photon elimination analysis is performed using waveform analysis techniques such as a template waveform fit. As a result, background events in the energy range of 48-58 MeV were reduced by 34 %. The calibration of the energy scale of the calorimeter with several calibration sources is also discussed to achieve a high resolution of 1.8 %.
@article{arxiv.2407.19417,
title = {Photon energy reconstruction with the MEG II liquid xenon calorimeter},
author = {Kensuke Yamamoto and Sei Ban and Lukas Gerritzen and Toshiyuki Iwamoto and Satoru Kobayashi and Ayaka Matsushita and Toshinori Mori and Rina Onda and Wataru Ootani and Atsushi Oya},
journal= {arXiv preprint arXiv:2407.19417},
year = {2024}
}
Comments
5 pages, 7 figures. Contribution to 20th International Conference on Calorimetry for Particle Physics (CALOR2024). Submitted to EPJ Web of Conferences