Journal
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
Volume 46, Issue 8, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6471/ab227d
Keywords
T2K; neutrino; neutrino oscillation; neutrino interaction; Mini-BooNE; CP violation
Categories
Funding
- MEXT, Japan
- NSERC, Canada [SAPPJ-2014-00031]
- NRC, Canada
- CFI, Canada
- CEA, France
- CNRS/IN2P3, France
- DFG, Germany
- INFN, Italy
- National Science Centre (NCN), Poland
- Ministry of Science and Higher Education, Poland
- RSF, Russia
- RFBR, Russia
- MES, Russia
- MINECO, Spain
- ERDF funds, Spain
- SNSF, Switzerland
- SERI, Switzerland
- STFC, UK
- DOE, USA
- ERC (FP7)
- 'la Caixa' Foundation [100010434, LCF/BQ/IN17/11620050]
- European Union's Horizon 2020 Research and Innovation programme under the Marie Sklodowska-Curie grant [713673]
- European Union's Horizon 2020 Research and Innovation programme under H2020 Grant [RISE-GA644294-JENNIFER 2020]
- JSPS, Japan
- Royal Society, UK
- Alfred P Sloan Foundation, USA
- DOE Early Career program, USA
- STFC [ST/H000992/1, ST/N003209/1, 1811339, ST/N000455/1, ST/M00001X/1, 1947570, ST/S000933/1, ST/S000909/1, ST/F009976/1, ST/V00204X/1, ST/N000242/1, ST/N000447/1, ST/S001174/1, ST/S003533/1, ST/K001604/1, ST/H000992/2] Funding Source: UKRI
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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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