Search for neutral-current induced single photon production at the ND280 near detector in T2K
Journal of Physics G: Nuclear and Particle Physics IOP Publishing 46:8 (2019) 08LT01
Abstract:
All rights reserved. Neutrino neutral-current (NC) induced single photon production is a subleading 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 finegrained 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 1020 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 cm2 (90% C.L.) per nucleon, using the J-PARC off-axis neutrino beam with an average energy of .En. ~ 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.Atmospheric neutrino oscillation analysis with improved event reconstruction in Super-Kamiokande IV
Progress of Theoretical and Experimental Physics Oxford University Press (OUP) 2019:5 (2019)
Search for light sterile neutrinos with the T2K far detector Super-Kamiokande at a baseline of 295km
Physical Review D American Physical Society 99:7 (2019) 071103
Abstract:
We perform a search for light sterile neutrinos using the data from the T2K far detector at a baseline of 295 km, with an exposure of 14.7(7.6)×10^20 protons on target in neutrino (antineutrino) mode. A selection of neutral-current interaction samples is also used to enhance the sensitivity to sterile mixing. No evidence of sterile neutrino mixing in the 3+1 model was found from a simultaneous fit to the charged-current muon, electron and neutral-current neutrino samples. We set the most stringent limit on the sterile oscillation amplitude sin^2θ24 for the sterile neutrino mass splitting Δm^2v41<3×10^−3eV^2/c^4.Measurement of the $\nu_{\mu}$ charged-current cross sections on water, hydrocarbon, iron, and their ratios with the T2K on-axis detectors
(2019)
Using world π±-nucleus scattering data to constrain an intranuclear cascade model
Physical Review D American Physical Society (APS) 99:5 (2019) 052007