Photon energy reconstruction with the MEG II liquid xenon calorimeter

The MEG II experiment searches for a charged-lepton-flavour-violating \(\mu \to e \gamma\) with the target sensitivity of \(6 \times 10^{-14}\). A liquid xenon calorimeter with VUV-sensitive photosensors measures photon position, timing, and energy. This paper concentrates on the precise photon ener...

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Published in:arXiv.org 2024-07
Main Authors: Yamamoto, Kensuke, Ban, Sei, Gerritzen, Lukas, Iwamoto, Toshiyuki, Kobayashi, Satoru, Matsushita, Ayaka, Mori, Toshinori, Onda, Rina, Ootani, Wataru, Oya, Atsushi
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Language:English
Subjects:
Calibration
Flavors
Leptons
Muons
Particle beams
Photon beams
Photons
Position measurement
Reconstruction
Waveforms
Xenon
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creator Yamamoto, Kensuke
Ban, Sei
Gerritzen, Lukas
Iwamoto, Toshiyuki
Kobayashi, Satoru
Matsushita, Ayaka
Mori, Toshinori
Onda, Rina
Ootani, Wataru
Oya, Atsushi
description The MEG II experiment searches for a charged-lepton-flavour-violating \(\mu \to e \gamma\) with the target sensitivity of \(6 \times 10^{-14}\). 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 \(3\text{-}5 \times 10^{7}~\text{s}^{-1}\), 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 an energy scale of the calorimeter with several calibration sources is also discussed to achieve a high resolution of 1.8 %.
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subjects Calibration
Flavors
Leptons
Muons
Particle beams
Photon beams
Photons
Position measurement
Reconstruction
Waveforms
Xenon
title Photon energy reconstruction with the MEG II liquid xenon calorimeter
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