New data from the T2K neutrino oscillation experiment produce the most precise measurement of the neutrino mixing parameter ��23. 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 ���� oscillation probability to determine oscillation parameters. The 68% confidence limit on sin2(��23) is 0.514-0.056+0.055 (0.511��0.055), assuming normal (inverted) mass hierarchy. The best-fit mass-squared splitting for normal hierarchy is ��m322=(2.51��0.10) ��10-3eV2/c4 (inverted hierarchy: ��m132=(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. �� 2014 American Physical Society.

Precise measurement of the neutrino mixing parameter ��23 from muon neutrino disappearance in an Off-Axis Beam / K., A., J., A., H. a., A., T., A., C., A., S., A., A., A., T., A., S., A., D., A., M., B., G., B., G., B., M., B., M., B., F., B., S., B., V., B., B., B., S., B., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 112:(2014). [10.1103/PhysRevLett.112.181801]

Precise measurement of the neutrino mixing parameter ��23 from muon neutrino disappearance in an Off-Axis Beam

DE ROSA, GIANFRANCA;PALLADINO, VITTORIO;
2014

Abstract

New data from the T2K neutrino oscillation experiment produce the most precise measurement of the neutrino mixing parameter ��23. 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 ���� oscillation probability to determine oscillation parameters. The 68% confidence limit on sin2(��23) is 0.514-0.056+0.055 (0.511��0.055), assuming normal (inverted) mass hierarchy. The best-fit mass-squared splitting for normal hierarchy is ��m322=(2.51��0.10) ��10-3eV2/c4 (inverted hierarchy: ��m132=(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. �� 2014 American Physical Society.
2014
Precise measurement of the neutrino mixing parameter ��23 from muon neutrino disappearance in an Off-Axis Beam / K., A., J., A., H. a., A., T., A., C., A., S., A., A., A., T., A., S., A., D., A., M., B., G., B., G., B., M., B., M., B., F., B., S., B., V., B., B., B., S., B., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 112:(2014). [10.1103/PhysRevLett.112.181801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/598851
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