| Issue |
EPJ Web Conf.
Volume 320, 2025
20th International Conference on Calorimetry in Particle Physics (CALOR 2024)
|
|
|---|---|---|
| Article Number | 00030 | |
| Number of page(s) | 4 | |
| DOI | https://doi.org/10.1051/epjconf/202532000030 | |
| Published online | 07 March 2025 | |
https://doi.org/10.1051/epjconf/202532000030
Photon energy reconstruction with the MEG II liquid xenon calorimeter
ICEPP, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
* e-mail: kensukey@icepp.s.u-tokyo.ac.jp
Published online: 7 March 2025
The MEG II experiment searches for a charged-lepton-flavour-violating μ → eε 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 × 107 s−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 %.
© The Authors, published by EDP Sciences, 2025
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