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Measurement of Neutrino Oscillation Parameters from Muon Neutrino Disappearance with an Off-Axis Beam

CollaborationWith : Blondel, Alain / Bravar, Alessandro / Haesler, Alexis / Dufour, Fanny / Korzenev, Alexander / Ravonel Salzgeber, Melody / Rayner, Mark / Scantamburlo, Enrico
Published in Physical Review Letters. 2013, vol. 111, no. 21, p. 211803
Abstract 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 sin2(θ23)=0.514±0.082 and mass splitting |Δm232|=2.44+0.17−0.15×10−3  eV2/c4. Our result corresponds to the maximal oscillation disappearance probability.
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T2K COLLABORATION. Measurement of Neutrino Oscillation Parameters from Muon Neutrino Disappearance with an Off-Axis Beam. In: Physical Review Letters, 2013, vol. 111, n° 21, p. 211803. https://archive-ouverte.unige.ch/unige:40179

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Deposited on : 2014-09-12

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