Publications associated with T2K

Search for neutral-current induced single photon production at the ND280 near detector in T2K

Journal of Physics G: Nuclear and Particle Physics 46 (2019)

The T2k Collaboration, K Abe, R Akutsu, A Ali, C Andreopoulos, L Anthony, M Antonova, S Aoki, A Ariga, Y Ashida, Y Awataguchi, Y Azuma, S Ban, M Barbi, GJ Barker, G Barr, C Barry, M Batkiewicz-Kwasniak, F Bench, V Berardi, S Berkman, RM Berner, L Berns, S Bhadra, S Bienstock, A Blondel, S Bolognesi, B Bourguille, SB Boyd, D Brailsford, A Bravar, C Bronner, MB Avanzini, J Calcutt, T Campbell, S Cao, SL Cartwright, MG Catanesi, A Cervera, A Chappell, C Checchia, D Cherdack, N Chikuma, G Christodoulou, J Coleman, G Collazuol, D Coplowe, A Cudd, A Dabrowska, GD Rosa, T Dealtry, PF Denner, SR Dennis, C Densham, FD Lodovico, N Dokania, S Dolan, O Drapier, KE Duffy, J Dumarchez, P Dunne, S Emery-Schrenk, A Ereditato, P Fernandez, T Feusels, AJ Finch, GA Fiorentini, G Fiorillo, C Francois, M Friend, Y Fujii, R Fujita, D Fukuda, Y Fukuda, K Gameil, C Giganti, F Gizzarelli, T Golan, M Gonin, DR Hadley, JT Haigh, P Hamacher-Baumann, M Hartz, T Hasegawa, NC Hastings, T Hayashino, Y Hayato, A Hiramoto, M Hogan, J Holeczek, NTH Van, F Hosomi, AK Ichikawa, M Ikeda, T Inoue, RA Intonti, T Ishida, T Ishii, M Ishitsuka, K Iwamoto

© 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.

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