Publications associated with T2K

Search for electron antineutrino appearance in a long-baseline muon antineutrino beam

Physical Review Letters American Physical Society 124 (2020) 161802

M Friend, K Fusshoeller, K Gameil, A Gorin, NC Hastings, J Holeczek, NT Hongvan, M Kabirnezhad, E Kearns, M Miura, M Nakahata, Y Nakajima, A Nakamura, KG Nakamura, TV Ngoc, K Niewczas, K Nishikawa, B Radics, C Riccio, E Rondio, S Roth, A Rubbia, AC Ruggeri, CA Ruggles, CM Schloesser

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 2.40σ 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.

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