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

AuthorsT2K 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, G.J.; Barr, G.; Barry, C.; Batkiewicz-Kwasniak, M.; Bench, F.; Berardi, V.; Berkman, S.; Berner, R.M.; Berns, L.; Bhadra, S.; Bienstock, S.; Blondel, A.; Bolognesi, S.; Bourguille, B.; Boyd, S.B.; Brailsford, D.; Bravar, A.; Bronner, C.; Avanzini, M.B.; Calcutt, J.; Campbell, T.; Cao, S.; Cartwright, S.L.; Catanesi, M.G.; Cervera Villanueva, Anselmo ; Chappell, A.; Checchia, C.; Cherdack, D.; Chikuma, N.; Christodoulou, G.; Coleman, J.; Collazuol, G.; Coplowe, D.; Cudd, A.; Dabrowska, A.; Fernandez Menendez, Pablo; Izmaylov, A. ; Jesus, C.; Labarga, L.; Lux, T.; Novella, Pau ; Vargas, D.
neutrino oscillation
neutrino interaction
CP violation
Issue DateJun-2019
CitationJournal of Physics G: Nuclear and Particle Physics 46 (8): 08LT01 (2019)
AbstractNeutrino 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.
Publisher version (URL)http://dx.doi.org/10.1088/1361-6471/ab227d
Identifiersdoi: 10.1088/1361-6471/ab227d
issn: 1361-6471
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