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  • 1902.03848v1

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

Research output: Contribution to journalJournal article

Published
Article number08LT01
<mark>Journal publication date</mark>1/08/2019
<mark>Journal</mark>Journal of Physics G: Nuclear and Particle Physics
Issue number8
Volume46
Number of pages16
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Neutrino neutral-current (NC) 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 x 10(20) 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 x 10(-38) cm(2) (90% C.L.) per nucleon, using the J-PARC off-axis neutrino beam with an average energy of <E-v > similar to 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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