Indication for the disappearance of reactor electron antineutrinos in the Double Chooz experiment

Y. Abe , C. Aberle , T. Akiri , J. C. dos Anjos , F. Ardellier , A. F. Barbosa , A. Baxter , M. Bergevin

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A. Bernstein T. J. C. Bezerra L. Bezrukhov E. Blucher M. Bongrand N. S. Bowden C. Buck J. Busenitz A. Cabrera E. Caden L. Camilleri R. Carr M. Cerrada P.-J. Chang P. Chimenti T. Classen A. P. Collin E. Conover J. M. Conrad S. Cormon J. I. Crespo-Anad\'on M. Cribier K. Crum A. Cucoanes M. V. D'Agostino E. Damon J. V. Dawson S. Dazeley M. Dierckxsens D. Dietrich Z. Djurcic M. Dracos V. Durand Y. Efremenko M. Elnimr Y. Endo A. Etenko E. Falk M. Fallot M. Fechner F. von Feilitzsch J. Felde S. M. Fernandes D. Franco A. J. Franke M. Franke H. Furuta R. Gama I. Gil-Botella L. Giot M. G\"oger-Neff L. F. G. Gonzalez M. C. Goodman J. TM. Goon D. Greiner B. Guillon N. Haag C. Hagner T. Hara F. X. Hartmann J. Hartnell T. Haruna J. Haser A. Hatzikoutelis T. Hayakawa M. Hofmann G. A. Horton-Smith M. Ishitsuka J. Jochum C. Jollet C. L. Jones F. Kaether L. Kalousis Y. Kamyshkov D. M. Kaplan T. Kawasaki G. Keefer E. Kemp H. de Kerret Y. Kibe T. Konno D. Kryn M. Kuze T. Lachenmaier C. E. Lane C. Langbrandtner T. Lasserre A. Letourneau D. Lhuillier H. P. Lima Jr M. Lindner Y. Liu J. M. L\'opez-Castan\~o J. M. LoSecco B. K. Lubsandorzhiev S. Lucht D. McKee J. Maeda C. N. Maesano C. Mariani J. Maricic J. Martino T. Matsubara G. Mention A. Meregaglia T. Miletic R. Milincic A. Milzstajn H. Miyata D. Motta Th. A. Mueller Y. Nagasaka K. Nakajima P. Novella M. Obolensky L. Oberauer A. Onillon A. Osborn I. Ostrovskiy C. Palomares S. J. M. Peeters I. M. Pepe S. Perasso P. Perrin P. Pfahler A. Porta W. Potzel R. Queval J. Reichenbacher B. Reinhold A. Remoto D. Reyna M. R\"ohling S. Roth H. A. Rubin Y. Sakamoto R. Santorelli F. Sato S. Sch\"onert S. Schoppmann U. Schwan T. Schwetz M. H. Shaevitz D. Shrestha J-L. Sida V. Sinev M. Skorokhvatov E. Smith J. Spitz A. Stahl I. Stancu M. Strait A. St\"uken F. Suekane S. Sukhotin T. Sumiyoshi Y. Sun Z. Sun R. Svoboda H. Tabata N. Tamura K. Terao A. Tonazzo M. Toups H. H. Trinh Thi C. Veyssiere S. Wagner H. Watanabe B. White C. Wiebusch L. Winslow M. Worcester M. Wurm E. Yanovitch F. Yermia K. Zbiri V. Zimmer

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classification ✦ hep-ex

keywords reactorchoozindicationsangantineutrinodisappearancedoubleelectron

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The Double Chooz Experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. A ratio of 0.944 $\pm$ 0.016 (stat) $\pm$ 0.040 (syst) observed to predicted events was obtained in 101 days of running at the Chooz Nuclear Power Plant in France, with two 4.25 GW$_{th}$ reactors. The results were obtained from a single 10 m$^3$ fiducial volume detector located 1050 m from the two reactor cores. The reactor antineutrino flux prediction used the Bugey4 measurement as an anchor point. The deficit can be interpreted as an indication of a non-zero value of the still unmeasured neutrino mixing parameter \sang. Analyzing both the rate of the prompt positrons and their energy spectrum we find \sang = 0.086 $\pm$ 0.041 (stat) $\pm$ 0.030 (syst), or, at 90% CL, 0.015 $<$ \sang $\ <$ 0.16.

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Indication for the disappearance of reactor electron antineutrinos in the Double Chooz experiment

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