Abstract
New data from the T2K neutrino oscillation experiment produce the most precise measurement of the neutrino mixing parameter . Using an off-axis neutrino beam with a peak energy of 0.6 GeV and a data set corresponding to protons on target, T2K has fit the energy-dependent oscillation probability to determine oscillation parameters. The 68% confidence limit on is (), assuming normal (inverted) mass hierarchy. The best-fit mass-squared splitting for normal hierarchy is (inverted hierarchy: ). 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.
- Received 6 March 2014
DOI:https://doi.org/10.1103/PhysRevLett.112.181801
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