T2K measurements of muon neutrino and antineutrino disappearance using 3.13 ×1021 protons on target
Abstract
We report measurements by the T2K experiment of the parameters θ23 and Δ m322 , 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 ×1021 protons on target (POT) in neutrino mode and 1.64 ×1021 POT in antineutrino mode are used. The best-fit values obtained by T2K were sin2(θ23) =0.51-0.07+0.06(0.43-0.05+0.21) and Δ m322=2.47-0.09+0.08(2.50-0.13+0.18)×10-3 eV2/c4 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 nonphysical 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.
- Publication:
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Physical Review D
- Pub Date:
- January 2021
- DOI:
- 10.1103/PhysRevD.103.L011101
- arXiv:
- arXiv:2008.07921
- Bibcode:
- 2021PhRvD.103a1101A
- Keywords:
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- High Energy Physics - Experiment
- E-Print:
- Phys. Rev. D 103, 011101 (2021)