Background-independent measurement of θ13 in Double Chooz

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. Cucoanes, E. Damon, J. V. Dawson, 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, T. Konno, 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. K. 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, K. Nakajima, Y. Nikitenko, P. Novella, M. Obolensky, L. Oberauer, 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, F. Sato, A. C. Schilithz, S. Schönert, S. Schoppmann, M. H. Shaevitz, R. Sharankova, S. Shimojima, 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, H. Watanabe, C. Wiebusch, L. Winslow, M. Wurm, G. Yang, F. Yermia, V. Zimmer

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45 Scopus citations


The oscillation results published by the Double Chooz Collaboration in 2011 and 2012 rely on background models substantiated by reactor-on data. In this analysis, we present a background-model-independent measurement of the mixing angle θ13 by including 7.53 days of reactor-off data. A global fit of the observed antineutrino rates for different reactor power conditions is performed, yielding a measurement of both θ13 and the total background rate. The results on the mixing angle are improved significantly by including the reactor-off data in the fit, as it provides a direct measurement of the total background rate. This reactor rate modulation analysis considers antineutrino candidates with neutron captures on both Gd and H, whose combination yields sin2(2θ13) = 0.102 ± 0.028(stat.) ± 0.033(syst.). The results presented in this study are fully consistent with the ones already published by Double Chooz, achieving a competitive precision. They provide, for the first time, a determination of θ13 that does not depend on a background model.

Original languageEnglish (US)
Pages (from-to)51-56
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - Jul 30 2014

Bibliographical note

Funding Information:
We thank the French electricity company EDF ; the European fund FEDER ; the Région de Champagne Ardenne ; the Département des Ardennes ; and the Communauté des Communes Ardennes Rives de Meuse . We acknowledge the support of the CEA , CNRS/IN2P3 , the computer center CCIN2P3 , and LabEx UnivEarthS in France; the Ministry of Education, Culture, Sports, Science, and Technology of Japan (MEXT) and the Japan Society for the Promotion of Science (JSPS); the Department of Energy and the National Science Foundation of the United States; the Ministerio de Ciencia e Innovación (MICINN) of Spain; the Max Planck Gesellschaft , and the Deutsche Forschungsgemeinschaft DFG ( SBH WI 2152 ), the Transregional Collaborative Research Center TR27 , the excellence cluster “Origin and Structure of the Universe”, and the Maier-Leibnitz-Laboratorium Garching in Germany; the Russian Academy of Sciences , the Kurchatov Institute and RFBR (the Russian Foundation for Basic Research); the Brazilian Ministry of Science, Technology and Innovation (MCTI) , the Financiadora de Estudos e Projetos (FINEP) , the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) , the São Paulo Research Foundation (FAPESP), and the Brazilian Network for High Energy Physics (RENAFAE) in Brazil.


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