1112.6353 (Y. Abe et al.)

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

Y. Abe, C. Aberle, T. Akiri, J. C. dos Anjos, F. Ardellier, A. F. Barbosa, A. Baxter, M. Bergevin, 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-Anadón, 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. Göger-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. López-Castanõ, 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. Röhling, S. Roth, H. A. Rubin, Y. Sakamoto, R. Santorelli, F. Sato, S. Schönert, 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. Stüken, 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

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.

View original: http://arxiv.org/abs/1112.6353