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  • First constraints on light sterile neutrino oscillations from combined appearance and disappearance searches with the MicroBooNE detector
    collaboration, MicroBooNE; Abratenko, P; D Andrade Aldana; Anthony, J; Balasubramanian, S; Baller, B; Barr, G; Bathe-Peters, L; Berkman, S; Bhattacharya, M; Bolton, T; Camilleri, L; Caratelli, D; I Caro Terrazas; Cavanna, F; Cerati, G; Conrad, J M; Convery, M; Crespo-Anadon, J I; M Del Tutto; Dennis, S R; Devitt, A; Duffy, K; Dytman, S; Eberly, B; Evans, J J; eman, W; Garcia-Gamez, D; Gardiner, S; G Ge; Gollapinni, S; Green, P; Greenlee, H; W Gu; Hen, O; Hicks, R; Hilgenberg, C; Horton-Smith, G A; Itay, R; James, C; Jiang, L; Kalra, D; Kamp, N; Karagiorgi, G; Ketchum, W; Kirby, M; Kobilarcik, T; Kreslo, I; Leibovitch, M B; Lepetic, I; J -Y Li; K Li; Lin, K; Louis, W C; Luo, X; Mariani, C; Martinez, N; Mills, J; Mistry, K; Mooney, M; Moor, A F; Moore, C D; Babu, S Mulleria; Navrer-Agasson, A; Nebot-Guinot, M; Nowak, J; Nunes, M; Oza, N; Palamara, O; Paolone, V; Parkinson, H; Piasetzky, E; Pophale, I; Qian, X; Radeka, V; Rochester, L; J Rodriguez Rondon; Rosenberg, M; Ross-Lonergan, M; Seligman, W; Smith, A; Soldner-Rembold, S; Spitz, J; J St John; Taniuchi, N; Terao, K; Toups, M; Tyler, J; Uchida, M A; Viren, B; Weber, M; White, A J; Wolbers, S; Wospakrik, M; Wresilo, K; Wright, N; Yandel, E; Yates, L E; Zennamo, J; Zhang, C

    arXiv (Cornell University), 12/2022
    Paper, Journal Article

    We present a search for eV-scale sterile neutrino oscillations in the MicroBooNE liquid argon detector, simultaneously considering all possible appearance and disappearance effects within the \(3+1\) active-to-sterile neutrino oscillation framework. We analyze the neutrino candidate events for the recent measurements of charged-current \(\nu_e\) and \(\nu_{\mu}\) interactions in the MicroBooNE detector, using data corresponding to an exposure of 6.37\(\times\)10\(^{20}\) protons on target from the Fermilab booster neutrino beam. We observe no evidence of light sterile neutrino oscillations and derive exclusion contours at the \(95\%\) confidence level in the plane of the mass-squared splitting \(\Delta m^2_{41}\) and the sterile neutrino mixing angles \(\theta_{\mu e}\) and \(\theta_{ee}\), excluding part of the parameter space allowed by experimental anomalies. Cancellation of \(\nu_e\) appearance and \(\nu_e\) disappearance effects due to the full \(3+1\) treatment of the analysis leads to a degeneracy when determining the oscillation parameters, which is discussed in this paper and will be addressed by future analyses.

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