Improved measurements of the neutrino mixing angle Ɵ13 with the double chooz detector

Y. Abe, J. C. dos Anjos, J. C. Barriere, E. Baussan, I. Bekman, M. Bergevin, T. J C Bezerra, L. Bezrukov, E. Blucher, C. Buck, J. Busenitz, A. Cabrera, E. Caden, L. Camilleri, R. Carr, M. Cerrada, P. J. Chang, E. Chauveau, P. Chimenti, A. P. CollinE. Conover, J. M. Conrad, J. I. Crespo-Anadón, K. Crum, A. S. Cucoanes, E. Damon, J. V. Dawson, J. Dhooghe, D. Dietrich, Z. Djurcic, M. Dracos, M. Elnimr, A. Etenko, M. Fallot, F. von Feilitzsch, J. Felde, S. M. Fernandes, V. Fischer, D. Franco, M. Franke, H. Furuta, I. Gil-Botella, L. Giot, M. Göger-Neff, L. F G Gonzalez, L. Goodenough, M. C. Goodman, C. Grant, N. Haag, T. Hara, J. Haser, M. Hofmann, G. A. Horton-Smith, A. Hourlier, M. Ishitsuka, J. Jochum, C. Jollet, F. Kaether, L. N. Kalousis, Y. Kamyshkov, D. M. Kaplan, T. Kawasaki, E. Kemp, H. de Kerret, D. Kryn, M. Kuze, T. Lachenmaier, C. E. Lane, T. Lasserre, A. Letourneau, D. Lhuillier, H. P. Lima, M. Lindner, J. M. López-Castaño, J. M. LoSecco, B. Lubsandorzhiev, S. Lucht, J. Maeda, C. Mariani, J. Maricic, J. Martino, T. Matsubara, G. Mention, A. Meregaglia, T. Miletic, R. Milincic, A. Minotti, Y. Nagasaka, Y. Nikitenko, P. Novella, L. Oberauer, M. Obolensky, A. Onillon, A. Osborn, C. Palomares, I. M. Pepe, S. Perasso, P. Pfahler, A. Porta, G. Pronost, J. Reichenbacher, B. Reinhold, M. Röhling, R. Roncin, S. Roth, B. Rybolt, Y. Sakamoto, R. Santorelli, A. C. Schilithz, S. Schönert, S. Schoppmann, M. H. Shaevitz, R. Sharankova, S. Shimojima, D. Shrestha, V. Sibille, V. Sinev, M. Skorokhvatov, E. Smith, J. Spitz, A. Stahl, I. Stancu, L. F F Stokes, M. Strait, A. Stüken, F. Suekane, S. Sukhotin, T. Sumiyoshi, Y. Sun, R. Svoboda, K. Terao, A. Tonazzo, H. H. Trinh Thi, G. Valdiviesso, N. Vassilopoulos, C. Veyssiere, M. Vivier, S. Wagner, N. Walsh, H. Watanabe, C. Wiebusch, L. Winslow, M. Wurm, G. Yang, F. Yermia, V. Zimmer

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Abstract

The Double Chooz experiment presents improved measurements of the neutrino mixing angle Ɵ13 using the data collected in 467.90 live days from a detector positioned at an average distance of 1050m from two reactor cores at the Chooz nuclear power plant. Several novel techniques have been developed to achieve significant reductions of the backgrounds and systematic uncertainties with respect to previous publications, whereas the efficiency of the (Formula Presented.) signal has increased. The value of Ɵ13 is measured to be sin213 = 0.090-0.029+0.032 from a fit to the observed energy spectrum. Deviations from the reactor (Formula Presented.) prediction observed above a prompt signal energy of 4MeV and possible explanations are also reported. A consistent value of Ɵ13 is obtained from a fit to the observed rate as a function of the reactor power independently of the spectrum shape and background estimation, demonstrating the robustness of the Ɵ13 measurement despite the observed distortion.

Original languageEnglish (US)
Article number86
JournalJournal of High Energy Physics
Volume2014
Issue number10
DOIs
StatePublished - Oct 14 2014

Keywords

  • Neutrino Detectors and Telescopes
  • Oscillation

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