T2K measurements of muon neutrino and antineutrino disappearance using $3.13\times 10^{21}$ protons on target

Abstract

We report measurements by the T2K experiment of the parameters ${\theta }_{23}$ and $\Delta m_{32}^2$ which govern the disappearance of muon neutrinos and antineutrinos in the three-flavor PMNS neutrino oscillation model at T2K's neutrino energy and propagation distance. Utilizing the ability of the experiment to run with either a mainly neutrino or a mainly antineutrino beam, muon-like events from each beam mode are used to measure these parameters separately for neutrino and antineutrino oscillations. Data taken from $1.49\times 10^{21}$ protons on target (POT) in neutrino mode and $1.64\times 10^{21}$ POT in antineutrino mode are used. The best-fit values obtained by T2K were ${\sin }^2\left({\theta }_{23}\right)=0.51_{-0.07}^{+0.06}\left(0.43_{-0.05}^{+0.21}\right)$ and $\Delta m_{32}^2=2.47_{-0.09}^{+0.08}\left(2.50_{-0.13}^{+0.18}\right)$\evmass for neutrinos (antineutrinos). No significant differences between the values of the parameters describing the disappearance of muon neutrinos and antineutrinos were observed. An analysis using an effective two-flavor neutrino oscillation model where the sine of the mixing angle is allowed to take non-physical values larger than 1 is also performed to check the consistency of our data with the three-flavor model. Our data were found to be consistent with a physical value for the mixing angle.

References in corpus (2)

• The T2K Neutrino Flux Prediction
• Theoretical uncertainties on quasielastic charged-current neutrino-nucleus cross sections

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