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Evidence of Electron Neutrino Appearance in a Muon Neutrino Beam

Abstract : The T2K collaboration reports evidence for electron neutrino appearance at the atmospheric mass splitting, |\Delta m_{32}^2|=2.4x10^{-3} eV^2. An excess of electron neutrino interactions over background is observed from a muon neutrino beam with a peak energy of 0.6 GeV at the Super-Kamiokande (SK) detector 295 km from the beam's origin. Signal and background predictions are constrained by data from near detectors located 280 m from the neutrino production target. We observe 11 electron neutrino candidate events at the SK detector when a background of 3.3\pm0.4(syst.) events is expected. The background-only hypothesis is rejected with a p-value of 0.0009 (3.1\sigma), and a fit assuming \nu_{\mu}->\nu_e oscillations with sin^2(2\theta_{23})=1, \delta_{CP}=0 and |\Delta m_{32}^2|=2.4x10^{-3} eV^2 yields sin^2(2\theta_{13})=0.088^{+0.049}_{-0.039}(stat.+syst.).
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Contributor : Sylvie Flores <>
Submitted on : Thursday, April 4, 2013 - 7:21:58 AM
Last modification on : Wednesday, December 9, 2020 - 11:58:02 AM

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N. Abgrall, D. Autiero, F.D.M. Blaszczyk, J.P.A.M. de Andre, O. Drapier, et al.. Evidence of Electron Neutrino Appearance in a Muon Neutrino Beam. Physical Review D, American Physical Society, 2013, 88, pp.032002. ⟨10.1103/PhysRevD.88.032002⟩. ⟨in2p3-00807576⟩



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