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Abratenko, P; Alterkait, O; Arellano, L; Asaadi, J; Balasubramanian, S; Baller, B; Barr, G; Barrow, D; Berkman, S; Bhanderi, A; Bhattacharya, M; Bogart, B; Bolton, T; Book, J Y; Brunetti, M B; Camilleri, L; Caratelli, D; Chen, Y; Conrad, J M; Convery, M; Cooper-Troendle, L; Crespo-Anadón, J I; Del Tutto, M; Dennis, S R; Detje, P; Duffy, K; Dytman, S; Eberly, B; Englezos, P; Foreman, W; Gao, F; Garcia-Gamez, D; Gardiner, S; Greenlee, H; Gu, L; Guenette, R; Guzowski, P; Hagaman, L; Horton-Smith, G A; Imani, Z; Irwin, B; Ismail, M; Ji, X; Jo, J H; Jwa, Y-J; Kalra, D; Kirby, M; Kreslo, I; Lepetic, I; Li, Y; Lin, K; Louis, W C; Luo, X; Martinez Caicedo, D A; Mawby, I; McConkey, N; Micallef, J; Miller, K; Moore, C D; Mora Lepin, L; Moudgalya, M M; Mulleriababu, S; Nebot-Guinot, M; Nowak, J; Pallat, N; Papadopoulou, A; Parkinson, H B; Pate, S F; Patel, N; Pophale, I; Radeka, V; Rafique, A; Reggiani-Guzzo, M; Rochester, L; Rodriguez Rondon, J; Ross-Lonergan, M; Safa, I; Schukraft, A; Seligman, W; Shaevitz, M H; Sharankova, R; Snider, E L; Soderberg, M; Spitz, J; Stancari, M; Tang, W; Taniuchi, N; Terao, K; Thorpe, C; Tsai, Y-T; Usher, T; Weber, M; Wongjirad, T; Wresilo, K; Wu, W; Yang, T; Yates, L E; Yu, H W; Zeller, G P; Zhang, C
Physical review letters, 01/2024, Letnik: 132, Številka: 4Journal Article
We present the first search for heavy neutral leptons (HNLs) decaying into νe^{+}e^{-} or νπ^{0} final states in a liquid-argon time projection chamber using data collected with the MicroBooNE detector. The data were recorded synchronously with the NuMI neutrino beam from Fermilab's main injector corresponding to a total exposure of 7.01×10^{20} protons on target. We set upper limits at the 90% confidence level on the mixing parameter |U_{μ4}|^{2} in the mass ranges 10≤m_{HNL}≤150 MeV for the νe^{+}e^{-} channel and 150≤m_{HNL}≤245 MeV for the νπ^{0} channel, assuming |U_{e4}|^{2}=|U_{τ4}|^{2}=0. These limits represent the most stringent constraints in the mass range 35<m_{HNL}<175 MeV and the first constraints from a direct search for νπ^{0} decays.
