Prospects for detecting the diffuse supernova neutrino background with JUNO
Angel Abusleme, Thomas Adam, S. Ahmad, Rizwan Ahmed, S. Aiello, M. Akram, Fengpeng An, Qi An, Giuseppe Andronico, Н. Анфимов, V. Antonelli, Tatiana Antoshkina, Burin Asavapibhop, J. P. A. M. de André, Didier Auguste, Nikita Balashov, W. Baldini, Andrea Barresi, D. Basilico, E. Baussan, Marco Bellato, Antonio Bergnoli, Thilo Birkenfeld, Sylvie Blin, David Blum, S.C. Blyth, Anastasia Bolshakova, M. Bongrand, Clément Bordereau, D. Breton, A. Brigatti, R. Brugnera, Riccardo Bruno, A. Budano, Mario Buscemi, José Busto, Ilya Butorov, J. Busenitz, Barbara Caccianiga, Hao Cai, X. Cai, Yanke Cai, Zhiyan Cai, Riccardo Callegari, Antonio Cammi, Agustín Campeny, Chuanya Cao, Guofu Cao, Jun Cao, R. Caruso, C. Cerna, J. F. Chang, Yun Chang, Pingping Chen, Po-An Chen, Shaomin Chen, Xurong Chen, Yi-Wen Chen, Yixue Chen, Yu Chen, Zhang Chen, Jie Cheng, Yaping Cheng, Alexey Chetverikov, D. Chiesa, P. Chimenti, A. Chukanov, Gérard Claverie, Catia Clementi, Barbara Clerbaux, Selma Conforti Di Lorenzo, Daniele Corti, F. Dal Corso, Olivia Dalager, C. De La Taille, Zhi Deng, Ziyan Deng, Wilfried Depnering, M. Fernández Díaz, Xuefeng Ding, Yayun Ding, Bayu Dirgantara, Sergey Dmitrievsky, Tadeáš Dohnal, Dmitry Dolzhikov, Georgy Donchenko, J. Dong, E. Doroshkevich, M. Dracos, Frédéric Druillole, Ran Du, Shuxian Du, S. Dusini, Martin Dvořák, T. Enqvist, Heike Enzmann, Andrea Fabbri, Donghua Fan, Lei Fan, J. Fang
Abstract
Abstract We present the detection potential for the diffuse supernova neutrino background (DSNB) at the Jiangmen Underground Neutrino Observatory (JUNO), using the inverse-beta-decay (IBD) detection channel on free protons. We employ the latest information on the DSNB flux predictions, and investigate in detail the background and its reduction for the DSNB search at JUNO. The atmospheric neutrino induced neutral current (NC) background turns out to be the most critical background, whose uncertainty is carefully evaluated from both the spread of model predictions and an envisaged in situ measurement. We also make a careful study on the background suppression with the pulse shape discrimination (PSD) and triple coincidence (TC) cuts. With latest DSNB signal predictions, more realistic background evaluation and PSD efficiency optimization, and additional TC cut, JUNO can reach the significance of 3σ for 3 years of data taking, and achieve better than 5σ after 10 years for a reference DSNB model. In the pessimistic scenario of non-observation, JUNO would strongly improve the limits and exclude a significant region of the model parameter space.