First combined analysis of neutrino and antineutrino oscillations at T2K

Abstract

T2K reports its first results in the search for CP violation in neutrino oscillations using appearance and disappearance channels for neutrino- and antineutrino-mode beam. The data include all runs from Jan 2010 to May 2016 and comprise $7.482\times 10^{20}$,protons on target in neutrino mode, which yielded in the far detector 32 e-like and 135 $\mu$-like events, and $7.471\times 10^{20}$,protons on target in antineutrino mode which yielded 4 e-like and 66 $\mu$-like events. Reactor measurements of ${\sin }^{2}2{\theta }_{13}$ have been used as an additional constraint. The one-dimensional confidence interval at 90% for ${\delta }_{CP}$ spans the range ($-3.13$, $-0.39$) for normal mass ordering. The CP conservation hypothesis (${\delta }_{CP}=0,\pi$) is excluded at 90% C.L.

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• The T2K Experiment
• Observation of Electron Neutrino Appearance in a Muon Neutrino Beam
• First Measurement of the Muon Neutrino Charged Current Quasielastic Double Differential Cross Section
• Inclusive Charged--Current Neutrino--Nucleus Reactions
• A unified approach for nucleon knock-out, coherent and incoherent pion production in neutrino interactions with nuclei
• Measurements of neutrino oscillation in appearance and disappearance channels by the T2K experiment with 6.6E20 protons on target
• Inclusive Quasi-Elastic Charged-Current Neutrino-Nucleus Reactions
• Measurement of the neutrino mass splitting and flavor mixing by MINOS
• Neutrino-nucleus quasi-elastic and 2p2h interactions up to 10 GeV
• The T2K Neutrino Flux Prediction
• First Measurement of the Muon Anti-Neutrino Double-Differential Charged Current Quasi-Elastic Cross Section
• Measurement of Muon Antineutrino Quasi-Elastic Scattering on a Hydrocarbon Target at E_ν ~ 3.5 GeV
• The T2K Fine-Grained Detectors
• First measurement of muon-neutrino disappearance in NOvA
• Differences in Quasi-Elastic Cross-Sections of Muon and Electron Neutrinos
• Reanalysis of bubble chamber measurements of muon-neutrino induced single pion production
• Measurements of the T2K neutrino beam properties using the INGRID on-axis near detector
• Measurement of Neutrino Oscillation Parameters from Muon Neutrino Disappearance with an Off-axis Beam
• Measurement of the neutrino mixing angle ${\theta }_{23}$ in NOvA
• Measurements of ${\pi }^{\pm }$, $K^{\pm }$, $K_S^0$, $\Lambda$ and proton production in proton-carbon interactions at 31 GeV/$c$ with the NA61/SHINE spectrometer at the CERN SPS
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• Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam
• The earth matter effects in neutrino oscillation experiments from Tokai to Kamioka and Korea
• Measurement of coherent ${\pi }^{+}$ production in low energy neutrino-Carbon scattering
• Measurement of the muon beam direction and muon flux for the T2K neutrino experiment

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