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Indication of electron neutrino appearance from an accelerator-produced off-axis muon neutrino beam

Research output: Contribution to journalJournal article


  • K. Abe
  • S. Bentham
  • G. S. Davies
  • A. Hatzikoutelis
  • T. Maryon
  • P. N. Ratoff
  • T2K Collaboration
Article number041801
<mark>Journal publication date</mark>18/07/2011
<mark>Journal</mark>Physical Review Letters
Issue number4
Number of pages8
<mark>Original language</mark>English


The T2K experiment observes indications of nu(mu) -> nu(mu) e appearance in data accumulated with 1.43 x 10(20) protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with |Delta m(23)(2)| = 2.4 x 10(-3) eV(2), sin(2)2 theta(23) = 1 and sin(2)2 theta(13) = 0, the expected number of such events is 1.5 +/- 0.3(syst). Under this hypothesis, the probability to observe six or more candidate events is 7 x 10(-3), equivalent to 2.5 sigma significance. At 90% C.L., the data are consistent with 0.03(0.04) < sin(2)2 theta(13) < 0.28(0.34) for delta(CP) = 0 and a normal (inverted) hierarchy.

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© 2011 American Physical Society