In:
Journal of Physics G: Nuclear and Particle Physics, IOP Publishing, Vol. 46, No. 8 ( 2019-08-01), p. 08LT01-
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 × 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 × 10 − 38 cm 2 (90% C.L.) per nucleon, using the J-PARC off-axis neutrino beam with an average energy of E ν ∼ 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.
Type of Medium:
Online Resource
ISSN:
0954-3899
,
1361-6471
DOI:
10.1088/1361-6471/ab227d
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2019
detail.hit.zdb_id:
1472964-7
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