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Scientific article
Letter
Open access
English

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

ContributorsT2K collaboration
Published inJournal of physics. G, Nuclear and particle physics, vol. 46, no. 8, 08LT01
Publication date2019-06-20
First online date2019-06-20
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 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 cm2 (90% C.L.) per nucleon, using the J-PARC off-axis neutrino beam with an average energy of 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.

eng
Keywords
  • Photon: single production
  • Photon: neutrinoproduction
  • Neutrino/mu: secondary beam
  • J-PARC Lab
  • Neutral current
  • Neutrino: oscillation
  • KAMIOKANDE
  • Near detector
  • Neutrino/e: particle identification
  • Photon: particle identification
  • Channel cross section: upper limit
  • Kinematics
  • Background
  • Gamma ray
  • Experimental results
Citation (ISO format)
T2K collaboration. Search for neutral-current induced single photon production at the ND280 near detector in T2K. In: Journal of physics. G, Nuclear and particle physics, 2019, vol. 46, n° 8, p. 08LT01. doi: 10.1088/1361-6471/ab227d
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Article (Published version)
accessLevelPublic
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ISSN of the journal0954-3899
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