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Measurement of neutrino oscillation parameters from muon neutrino disappearance with an off-axis beam

Research output: Contribution to journalJournal article


Article number211803
<mark>Journal publication date</mark>19/11/2013
<mark>Journal</mark>Physical Review Letters
Issue number21
Number of pages7
<mark>Original language</mark>English


The T2K Collaboration reports a precision measurement of muon neutrino disappearance with an off-axis neutrino beam with a peak energy of 0.6 GeV. Near detector measurements are used to constrain the neutrino flux and cross section parameters. The Super-Kamiokande far detector, which is 295 km downstream of the neutrino production target, collected data corresponding to 3.01×1020 protons on target. In the absence of neutrino oscillations, 205±17 (syst) events are expected to be detected while only 58 muon neutrino event candidates are observed. A fit to the neutrino rate and energy spectrum, assuming three neutrino flavors and normal mass hierarchy yields a best-fit mixing angle sin⁡2(θ23)=0.514±0.082 and mass splitting |Δm322|=2.44-0.15+0.17×10-3  eV2/c4. Our result corresponds to the maximal oscillation disappearance probability.

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© 2013 American Physical Society