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

Abe, K, Akutsu, R, Ali, A, Alt, C, Andreopoulos, C ORCID: 0000-0003-2020-8215, Anthony, L, Antonova, M, Aoki, S, Ariga, A, Ashida, Y
et al (show 323 more authors) (2019) Search for neutral-current induced single photon production at the ND280 near detector in T2K. JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 46 (8). 08-.

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Neutrino neutral-current induced single photon production is a sub-leading 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 fine-grained 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$\times 10^{20}$ protons-on-targets neutrino mode data. We do not find positive evidence of neutral current induced single photon production in this sample. We set the model-dependent upper limit on the cross-section for this process, at 0.114$\times 10^{-38}$ cm$^2$ (90\% C.L.) per nucleon, using the J-PARC off-axis neutrino beam with an average energy of $\left<E_\nu\right>\sim 0.6$ 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.

Item Type: Article
Additional Information: 5 figures, 1 table
Uncontrolled Keywords: T2K, neutrino, neutrino oscillation, neutrino interaction, Mini-BooNE, CP violation
Depositing User: Symplectic Admin
Date Deposited: 14 Mar 2019 16:20
Last Modified: 19 Jan 2023 00:57
DOI: 10.1088/1361-6471/ab227d
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