Prediction of energy resolution in the JUNO experiment*
A. C. Abusleme Hoffman, Thomas Adam, Kai Adamowicz, S. Ahmad, Rizwan Ahmed, S. Aiello, Fengpeng 丰鹏 An 安, Qi 琪 An 安, Giuseppe Andronico, Н. Анфимов, V. Antonelli, Tatiana Antoshkina, J. P. A. M. de André, Didier Auguste, Weidong 伟东 Bai 白, Nikita Balashov, W. Baldini, Andrea Barresi, D. Basilico, E. Baussan, Marco Bellato, Marco Beretta, Antonio Bergnoli, D. Bick, Lukas Bieger, S. Biktemerova, Thilo Birkenfeld, Iwan Blake, David Blum, S.C. Blyth, Anastasia Bolshakova, M. Bongrand, Clément Bordereau, D. Breton, A. Brigatti, R. Brugnera, Riccardo Bruno, A. Budano, José Busto, J. Busenitz, Barbara Caccianiga, Hao 浩 Cai 蔡, Xiao 啸 Cai 蔡, Yanke Cai, Zhiyan 志岩 Cai 蔡, S. Callier, S. Calvez, Antonio Cammi, Agustín Campeny, Chuanya Cao, Guofu 国富 Cao 曹, Jun 俊 Cao 曹, R. Caruso, C. Cerna, Vanessa Cerrone, Jinfan 劲帆 Chang 常, Yun 昀 Chang 张, Auttakit Chatrabhuti, Chao 超 Chen 陈, Guoming 国明 Chen 陈, Pingping 平平 Chen 陈, Shaomin 少敏 Chen 陈, Xin 新 Chen 陈, Yiming 一鸣 Chen 陈, Yixue 义学 Chen 陈, Yu 羽 Chen 陈, Zelin 泽麟 Chen 陈, Zhangming Chen, Zhiyuan 志源 Chen 陈, Zikang 梓康 Chen 陈, Jie 捷 Cheng 程, Yaping 雅苹 Cheng 程, YuChin 宇晉 Cheng 鄭, Alexander Chepurnov, Alexey Chetverikov, Davide Chiesa, P. Chimenti, Yen-Ting Chin, Po-Lin 伯麟 Chou 周, Ziliang Chu, A. Chukanov, Gérard Claverie, Catia Clementi, B. Clerbaux, Marta Colomer Molla, Selma Conforti Di Lorenzo, Alberto Coppi, Daniele Corti, Simon Csakli, Chenyang 晨阳 Cui 崔, F. Dal Corso, Olivia Dalager, Jaydeep Datta, C. De La Taille, Zhi 智 Deng 邓, Ziyan 子艳 Deng 邓, Xiaoyu 晓雨 Ding 丁, Xuefeng 雪峰 Ding 丁, Yayun 雅韵 Ding 丁, Bayu Dirgantara
Abstract
Abstract This paper presents an energy resolution study of the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of the liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The results of this study reveal an energy resolution of 2.95% at 1 MeV. Furthermore, this study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data collection. Moreover, it provides a guideline for comprehending the energy resolution characteristics of liquid scintillator-based detectors.