2019/11/14 by K. Abe, R. Akutsu, A. Ali +341
Physics and Astronomy · #hep-ex
paper · pdf · doi:10.1103/physrevlett.124.161802
published as Phys. Rev. Lett. 124, 161802 (2020) · arXiv admin note: text overlap with arXiv:1910.09439
arxiv created 2019/11/14 · arxiv updated 2020/04/29
Electron antineutrino appearance is measured by the T2K experiment in an accelerator-produced antineutrino beam, using additional neutrino beam operation to constrain parameters of the PMNS mixing matrix. T2K observes 15 candidate electron antineutrino events with a background expectation of 9.3 events. Including information from the kinematic distribution of observed events, the hypothesis of no electron antineutrino appearance is disfavored with a significance of 2.40σ and no discrepancy between data and PMNS predictions is found. A complementary analysis that introduces an additional free parameter which allows non-PMNS values of electron neutrino and antineutrino appearance also finds no discrepancy between data and PMNS predictions.