PT Journal
AU T2K Collaboration (Abe, Kea
   Antonova, M
   Cervera-Villanueva, A
   Fernandez, P
   Izmaylov, A
   Novella, P
TI Search for Electron Antineutrino Appearance in a Long-Baseline Muon Antineutrino Beam
SO Physical Review Letters
JI Phys. Rev. Lett.
PY 2020
BP 161802
EP 8pp
VL 124
IS 16
DI 10.1103/PhysRevLett.124.161802
LA English
AB 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 Pontecorvo-Maki-Nakagawa-Sakata (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 2.40s 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.
ER