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  • Search for Signatures of Sterile Neutrinos with Double Chooz
    The Double Chooz Collaboration; Abrahão, T; Almazan, H; dos Anjos, J C; Appel, S; Barriere, J C; Bekman, I; Bezerra, T J C; Bezrukov, L; Blucher, E; Brugière, T; Buck, C; Busenitz, J; Cabrera, A; Cerrada, M; Chauveau, E; Chimenti, P; Corpace, O; Dawson, J V; Djurcic, Z; Etenko, A; Furuta, H; Gil-Botella, I; Givaudan, A; Gomez, H; Gonzalez, L F G; Goodman, M C; Hara, T; Haser, J; Hellwig, D; Hourlier, A; Ishitsuka, M; Jochum, J; Jollet, C; Kale, K; Kaneda, M; Karakac, M; Kawasaki, T; Kemp, E; de Kerret, H; Kryn, D; Kuze, M; Lachenmaier, T; Lane, C E; Lasserre, T; Lastoria, C; Lhuillier, D; Lima, H P; Lindner, M; López-Castaño, J M; LoSecco, J M; Lubsandorzhiev, B; Maeda, J; Mariani, C; Maricic, J; Martino, J; Matsubara, T; Mention, G; Meregaglia, A; Miletic, T; Milincic, R; Minotti, A; Navas-Nicolás, D; Novella, P; Oberauer, L; Obolensky, M; Onillon, A; Oralbaev, A; Palomares, C; Pepe, I M; Pronost, G; Reichenbacher, J; Reinhold, B; Schönert, S; Schoppmann, S; Scola, L; Sharankova, R; Sibille, V; Sinev, V; Skorokhvatov, M; Soldin, P; Stahl, A; Stancu, I; Stokes, L F F; Suekane, F; Sukhotin, S; Sumiyoshi, T; Sun, Y; Veyssiere, C; Viaud, B; Vivier, M; Wagner, S; Wiebusch, C; Yang, G; Yermia, F

    arXiv.org, 07/2021
    Paper, Journal Article

    We present a search for signatures of neutrino mixing of electron anti-neutrinos with additional hypothetical sterile neutrino flavors using the Double Chooz experiment. The search is based on data from 5 years of operation of Double Chooz, including 2 years in the two-detector configuration. The analysis is based on a profile likelihood, i.e.\ comparing the data to the model prediction of disappearance in a data-to-data comparison of the two respective detectors. The analysis is optimized for a model of three active and one sterile neutrino. It is sensitive in the typical mass range \(5 \cdot 10^{-3} \) eV\(^2 \lesssim \Delta m^2_{41} \lesssim 3\cdot 10^{-1} \) eV\(^2\) for mixing angles down to \(\sin^2 2\theta_{14} \gtrsim 0.02\). No significant disappearance additionally to the conventional disappearance related to \(\theta_{13} \) is observed and correspondingly exclusion bounds on the sterile mixing parameter \(\theta_{14} \) as function of \( \Delta m^2_{41} \) are obtained.

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