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Type: Artigo
Title: Measurement of theta(13) in Double Chooz using neutron captures on hydrogen with novel background rejection techniques
Author: Abe, Y.
Appel, S.
Abrahao, T.
Almazan, H.
Alt, C.
dos Anjos, J. C.
Barriere, J. C.
Baussan, E.
Bekman, I.
Bergevin, M.
Bezerra, T. J. C.
Bezrukov, L.
Blucher, E.
Brugiere, T.
Buck, C.
Busenitz, J.
Cabrera, A.
Camilleri, L.
Carr, R.
Cerrada, M.
Chauveau, E.
Chimenti, P.
Collin, A. P.
Conrad, J. M.
Crespo-Anadon, J. I.
Crum, K.
Cucoanes, A. S.
Damon, E.
Dawson, J. V.
Dhooghe, J.
Dietrich, D.
Djurcic, Z.
Dracos, M.
Etenko, A.
Fallot, M.
von Feilitzsch, F.
Felde, J.
Fernandes, S. M.
Fischer, V.
Franco, D.
Franke, M.
Furuta, H.
Gil-Botella, I.
Giot, L.
Goger-Neff, M.
Gomez, H.
Gonzalez, L. F. G.
Goodenough, L.
Goodman, M. C.
Haag, N.
Hara, T.
Haser, J.
Hellwig, D.
Hofmann, M.
Horton-Smith, G. A.
Hourlier, A.
Ishitsuka, M.
Jochum, J.
Jollet, C.
Kaether, F.
Kalousis, L. N.
Kamyshkov, Y.
Kaneda, M.
Kaplan, D. M.
Kawasaki, T.
Kemp, E.
de Kerret, H.
Kryn, D.
Kuze, M.
Lachenmaier, T.
Lane, C. E.
Lasserre, T.
Letourneau, A.
Lhuillier, D.
Lima, H. P.
Lindner, M.
Lopez-Castano, J. M.
LoSecco, J. M.
Lubsandorzhiev, B.
Lucht, S.
Maeda, J.
Mariani, C.
Maricic, J.
Martino, J.
Matsubara, T.
Mention, G.
Meregaglia, A.
Miletic, T.
Milincic, R.
Minotti, A.
Nagasaka, Y.
Navas-Nicolas, D.
Novella, P.
Oberauer, L.
Obolensky, M.
Onillon, A.
Osborn, A.
Palomares, C.
Pepe, I. M.
Perasso, S.
Porta, A.
Pronost, G.
Reichenbacher, J.
Reinhold, B.
Rohling, M.
Roncin, R.
Rybolt, B.
Sakamoto, Y.
Santorelli, R.
Schilithz, A. C.
Schonert, S.
Schoppmann, S.
Shaevitz, M. H.
Sharankova, R.
Shrestha, D.
Sibille, V.
Sinev, V.
Skorokhvatov, M.
Smith, E.
Soiron, M.
Spitz, J.
Stahl, A.
Stancu, I.
Stokes, L. F. F.
Strait, M.
Suekane, F.
Sukhotin, S.
Sumiyoshi, T.
Sun, Y.
Svoboda, R.
Terao, K.
Tonazzo, A.
Thi, H. H. T.
Valdiviesso, G.
Vassilopoulos, N.
Veyssiere, C.
Vivier, M.
Wagner, S.
Walsh, N.
Watanabe, H.
Wiebusch, C.
Wurm, M.
Yang, G.
Yermia, F.
Zimmer, V.
Abstract: The Double Chooz collaboration presents a measurement of the neutrino mixing angle theta(13) using reactor (nu) over bar (e) observed via the inverse beta decay reaction in which the neutron is captured on hydrogen. This measurement is based on 462.72 live days data, approximately twice as much data as in the previous such analysis, collected with a detector positioned at an average distance of 1050m from two reactor cores. Several novel techniques have been developed to achieve significant reductions of the backgrounds and systematic uncertainties. Accidental coincidences, the dominant background in this analysis, are suppressed by more than an order of magnitude with respect to our previous publication by a multi-variate analysis. These improvements demonstrate the capability of precise measurement of reactor (nu) over bar (e) without gadolinium loading. Spectral distortions from the (nu) over bar (e) reactor flux predictions previously reported with the neutron capture on gadolinium events are confirmed in the independent data sample presented here. A value of sin(2) 2 theta(13) = 0.095(0.039)(+0.039)(stat+syst) is obtained from a fit to the observed event rate as a function of the reactor power, a method insensitive to the energy spectrum shape. A simultaneous fit of the hydrogen capture events and of the gadolinium capture events yields a measurement of sin(2) 2 theta(13) = 0.088 +/- 0.033(stat+syst).
Subject: Oscilações
Interações eletro-fracas
Detectores de neutrinos
Country: Itália
Editor: Societa Italiana di Fisica
Citation: Journal Of High Energy Physics. Springer, p. 163, 2016.
Rights: aberto
Identifier DOI: 10.1007/JHEP01(2016)163
Date Issue: 2016
Appears in Collections:IFGW - Artigos e Outros Documentos

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