Precise Measurement of the Neutrino Mixing Parameter θ23 from Muon Neutrino Disappearance in an Off-Axis Beam

Abe, K and al., et (2014) Precise Measurement of the Neutrino Mixing Parameter θ23 from Muon Neutrino Disappearance in an Off-Axis Beam Phys. Rev. Lett., 112 (18). 181801-. ISSN 0031-9007, 1079-7114

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Abstract

New data from the T2K neutrino oscillation experiment produce the most precise measurement of the neutrino mixing parameter θ<inf>23</inf>. Using an off-axis neutrino beam with a peak energy of 0.6 GeV and a data set corresponding to 6.57 × 10²⁰protons on target, T2K has fit the energy-dependent ν<inf>μ</inf>oscillation probability to determine oscillation parameters. The 68% confidence limit on sin²(θ<inf>23</inf>) is 0.514<inf>-0.056</inf> ^+0.055(0.511 ± 0.055), assuming normal (inverted) mass hierarchy. The best-fit mass-squared splitting for normal hierarchy is Δm<inf>32</inf> ²= (2.51 × 0.10) × 10^-3eV²/c⁴(inverted hierarchy: Δm<inf>13</inf>= (2.48 ± 0.10) × 10^-3eV²/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.

Item Type:	Article
Additional Information:	## TULIP Type: Articles/Papers (Journal) ##
Uncontrolled Keywords:	T2K Collaboration
Depositing User:	Symplectic Admin
Date Deposited:	12 Oct 2020 09:42
Last Modified:	22 Jan 2026 19:44
DOI:	10.1103/PhysRevLett.112.181801
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3009958
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Available Versions of this Item

• Precise Measurement of the Neutrino Mixing Parameter from Muon Neutrino Disappearance in an Off-Axis Beam (deposited 03 May 2017 09:13)
  • Precise Measurement of the Neutrino Mixing Parameter θ23 from Muon Neutrino Disappearance in an Off-Axis Beam (deposited 12 Oct 2020 09:42) [Currently Displayed]