Precise Measurement of the Neutrino Mixing Parameter theta23 from Muon Neutrino Disappearance in an Off-Axis Beam

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Abstract

New data from the T2K neutrino oscillation experiment produce the most precise measurement of the neutrino mixing parameter θ23. Using an off-axis neutrino beam with a peak energy of 0.6 GeV and a data set corresponding to 6.57×1020
protons on target, T2K has fit the energy-dependent νμ oscillation probability to determine oscillation parameters. The 68% confidence limit on sin2(θ23) is 0.51
4+0.055−0.056 (0.511±0.055), assuming normal (inverted) mass hierarchy. The best-fit mass-squared splitting for normal hierarchy is Δm232=(2.51±0.10)×10
−3 eV2/c4 (inverted hierarchy: Δm213=(2.48±0.10)×10−3  eV2/c4). Adding a model of multinucleon interactions that affect neutrino energy reconstruction is found to produce only small biases in neutrino oscillation parameter extraction at current levels of statistical uncertainty.
Original languageEnglish
Pages (from-to)181801
Number of pages1
JournalPhys.Rev.Lett.
Volume112
Issue number18
DOIs
Publication statusPublished - 2014

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