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    Ashida, Y; Barker, G J; Barr, G; Barrow, D; Barry, C; Berkman, S; Berns, L; Bienstock, S; Bravo Berguño, D; Catanesi, M G; Cervera, A; De Rosa, G; Dennis, S R; Dokania, N; Dolan, S; Dumarchez, J; Eklund, L; Emery-Schrenk, S; Feusels, T; Fiorillo, G; Francois, C; Fukuda, R; Giganti, C; Golan, T; Gorin, A; Hadley, D R; Haigh, J T; Hartz, M; Iwamoto, K; Jakkapu, M; Kabirnezhad, M; Kajita, T; Kakuno, H; Khabibullin, M; Khotjantsev, A; King, S; Koch, L; Kostin, A; Kudenko, Y; Kurjata, R; Kuze, M; Labarga, L; Lamoureux, M; Laveder, M; Lawe, M; Li, X; Magaletti, L; Mahn, K; Malek, M; Marino, A D; Martin, J F; Maruyama, T; Matsubara, T; McCarthy, M; McFarland, K S; Minamino, A; Munteanu, L; Nakahata, M; Nakaya, T; Nantais, C; Nonnenmacher, T S; Novella, P; Odagawa, T; Okumura, K; Owen, R A; Oyama, Y; Palladino, V; Pavin, M; Penn, G C; Pistillo, C; Radermacher, T; Ratoff, P N; Riccio, C; Rubbia, A; Rychter, A; Shaker, F; Shaykina, A; Shiozawa, M; Shorrock, W; Shvartsman, A; Smirnov, A; Smy, M; Tada, M; Tajima, M; Takeda, A; Tanaka, H K; Tanaka, H A; Towstego, T; Valder, S; Vasseur, G; Volkov, V V; Walsh, J G; Wark, D; Wilking, M J; Yano, T; Yen, S; Yoshida, T; Zalewska, A; Zito, M; Zykova, A

    Physical review letters, 04/2020, Letnik: 124, Številka: 16
    Journal Article

    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.