Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam

Abstract

T2K reports its first measurements of the parameters governing the disappearance of ${\bar{\nu }}_{\mu }$ in an off-axis beam due to flavor change induced by neutrino oscillations. The quasimonochromatic ${\bar{\nu }}_{\mu }$ beam, produced with a peak energy of 0.6 GeV at J-PARC, is observed at the far detector Super-Kamiokande, 295 km away, where the ${\bar{\nu }}_{\mu }$ survival probability is expected to be minimal. Using a dataset corresponding to $4.01\times 10^{20}$ protons on target, $34$ fully contained $\mu$-like events were observed. The best-fit oscillation parameters are ${\sin }^2({\bar{\theta }}_{23})=0.45$ and $|\Delta {\bar{m}}_{32}^2|=2.51\times 10^{-3}$ eV${}^2$ with 68% confidence intervals of 0.38 - 0.64 and 2.26 - 2.80 $\times 10^{-3}$ eV${}^2$ respectively. These results are in agreement with existing antineutrino parameter measurements and also with the ${\nu }_{\mu }$ disappearance parameters measured by T2K.

arXiv comment8 pages, 4 figures, revision made following to referee comments, the link to the data release page was added

References in corpus (15)

• The T2K Experiment
• First Measurement of the Muon Neutrino Charged Current Quasielastic Double Differential Cross Section
• Inclusive Charged--Current Neutrino--Nucleus Reactions
• 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
• 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
• Calibration of the Super-Kamiokande Detector
• The T2K Fine-Grained Detectors
• Measurements of the T2K neutrino beam properties using the INGRID on-axis near detector
• 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
• An improved measurement of muon antineutrino disappearance in MINOS
• Search for Differences in Oscillation Parameters for Atmospheric Neutrinos and Antineutrinos at Super-Kamiokande
• The earth matter effects in neutrino oscillation experiments from Tokai to Kamioka and Korea

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• Systematic uncertainties in long-baseline neutrino-oscillation experiments
• Direct Measurement of Nuclear Dependence of Charged Current Quasielastic-like Neutrino Interactions using MINERvA
• Updated T2K measurements of muon neutrino and antineutrino disappearance using 1.5e21 protons on target
• Muon anomalous magnetic moment in the standard model extension
• Pinning down neutrino oscillation parameters in the 2-3 sector with a mgnetised atmospheric neutrino detector: a new study
• Quasielastic production of polarized hyperons in antineutrino--nucleon reactions
• Fermion mass hierarchy from nonuniversal abelian extensions of the Standard Model
• Confronting Tri-direct CP-symmetry models to neutrino oscillation experiments
• Probing Lorentz violation effects via a laser beam interacting with a high-energy charged lepton beam
• A Radiative Model of Quark Masses with Binary Tetrahedral Symmetry
• First Antineutrino Oscillation Results from T2K
• Upgrade of the T2K near detector ND280: effect on oscillation and cross-section analysis