Updated T2K measurements of muon neutrino and antineutrino disappearance using 1.5×1021 protons on target

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Abstract

We report measurements by the T2K experiment of the parameters θ23 and Δm322 governing the disappearance of muon neutrinos and antineutrinos in the three-flavor neutrino oscillation model. Utilizing the ability of the experiment to run with either a mainly neutrino or a mainly antineutrino beam, the parameters are measured separately for neutrinos and antineutrinos. Using 7.482×1020 POT in neutrino running mode and 7.471×1020 POT in antineutrino mode, T2K obtained sin2(θ23)=0.51-0.07+0.08 and Δm322=2.53-0.13+0.15×10-3 eV2/c4 for neutrinos, and sin2(θ-23)=0.42-0.07+0.25 and Δm-232=2.55-0.27+0.33×10-3 eV2/c4 for antineutrinos (assuming normal mass ordering). No significant differences between the values of the parameters describing the disappearance of muon neutrinos and antineutrinos were observed.

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Abe, K., Amey, J., Andreopoulos, C., Antonova, M., Aoki, S., Ariga, A., … Żmuda, J. (2017). Updated T2K measurements of muon neutrino and antineutrino disappearance using 1.5×1021 protons on target. Physical Review D, 96(1). https://doi.org/10.1103/PhysRevD.96.011102

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