Search for neutral-current induced single photon production at the ND280 near detector in T2K
© 2019 Institute of Physics Publishing. All rights reserved. Neutrino neutral-current (NC) induced single photon production is a subleading order process for accelerator-based neutrino beam experiments including T2K. It is, however, an important process to understand because it is a background for electron (anti)neutrino appearance oscillation experiments. Here, we performed the first search of this process below 1 GeV using the finegrained detector at the T2K ND280 off-axis near detector. By reconstructing single photon kinematics from electron positron pairs, we achieved 95% pure gamma ray sample from 5.738 1020 protons-on-targets neutrino mode data. We do not find positive evidence of NC induced single photon production in this sample. We set the model-dependent upper limit on the cross-section for this process, at 0.114 10-38 cm2 (90% C.L.) per nucleon, using the J-PARC off-axis neutrino beam with an average energy of .En. ~ 0.6 GeV. This is the first limit on this process below 1.GeV which is important for current and future oscillation experiments looking for electron neutrino appearance oscillation signals.
The T2k Collaboration, ; Abe, K; Akutsu, R; Ali, A; Andreopoulos, C; Anthony, L; Antonova, M; Aoki, S; Ariga, A; Ashida, Y; Awataguchi, Y; Azuma, Y; Ban, S; Barbi, M; Barker, GJ; Barr, G; Barry, C; Batkiewicz-Kwasniak, M; Bench, F; Berardi, V; Berkman, S; Berner, RM; Berns, L; Bhadra, S; Bienstock, S; Blondel, A; Bolognesi, S; Bourguille, B; Boyd, SB; Brailsford, D; Bravar, A; Bronner, C; Avanzini, MB; Calcutt, J; Campbell, T; Cao, S; Cartwright, SL; Catanesi, MG; Cervera, A; Chappell, A; Checchia, C; Cherdack, D; Chikuma, N; Christodoulou, G; Coleman, J; Collazuol, G; Coplowe, D; Cudd, A; Dabrowska, A; Rosa, GD; Dealtry, T; Denner, PF; Dennis, SR; Densham, C; Lodovico, FD; Dokania, N; Dolan, S; Drapier, O; Duffy, KE; Dumarchez, J; Dunne, P; Emery-Schrenk, S; Ereditato, A; Fernandez, P; Feusels, T; Finch, AJ; Fiorentini, GA; Fiorillo, G; Francois, C; Friend, M; Fujii, Y; Fujita, R; Fukuda, D; Fukuda, Y; Gameil, K; Giganti, C; Gizzarelli, F; Golan, T; Gonin, M; Hadley, DR; Haigh, JT; Hamacher-Baumann, P; Hartz, M; Hasegawa, T; Hastings, NC; Hayashino, T; Hayato, Y; Hiramoto, A; Hogan, M; Holeczek, J; Van, NTH; Hosomi, F; Ichikawa, AK; Ikeda, M; Inoue, T; Intonti, RA; Ishida, T; Ishii, T; Ishitsuka, M; Iwamoto, K
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