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Search for Differences in Oscillation Parameters for Atmospheric Neutrinos and Antineutrinos at Super-Kamiokande

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arxiv 1109.1621 v2 pith:S2S2ASYR submitted 2011-09-08 hep-ex

Search for Differences in Oscillation Parameters for Atmospheric Neutrinos and Antineutrinos at Super-Kamiokande

Super-Kamiokande Collaboration: K. Abe , Y. Hayato , T. Iida , M. Ikeda , K. Iyogi , J. Kameda , Y. Koshio , Y. Kozuma
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M. Miura S. Moriyama M. Nakahata S. Nakayama Y. Obayashi H. Sekiya M. Shiozawa Y. Suzuki A. Takeda Y. Takenaga Y. Takeuchi K. Ueno K. Ueshima H. Watanabe S. Yamada T. Yokozawa C. Ishihara H. Kaji K. P. Lee T. Kajita K. Kaneyuki T. McLachlan K. Okumura Y. Shimizu N. Tanimoto K. Martens M. R. Vagins L. Labarga L. M. Magro F. Dufour E. Kearns M. Litos J.L. Raaf J.L. Stone L.R. Sulak M. Goldhaber K. Bays W.R. Kropp S. Mine C. Regis M. B. Smy H. W. Sobel K. S. Ganezer J. Hill W. E. Keig J. S. Jang J. Y. Kim I. T. Lim J. B. Albert K. Scholberg C. W. Walter R. Wendell T. M. Wongjirad S. Tasaka J. G. Learned S. Matsuno T. Hasegawa T. Ishida T. Ishii T. Kobayashi T. Nakadaira K. Nakamura K. Nishikawa H. Nishino Y. Oyama K. Sakashita T. Sekiguchi T. Tsukamoto A. T. Suzuki A. Minamino T. Nakaya Y. Fukuda Y. Itow G. Mitsuka T. Tanaka C. K. Jung I. Taylor C. Yanagisawa H. Ishino A. Kibayashi S. Mino T. Mori M. Sakuda H. Toyota Y. Kuno S. B. Kim B. S. Yang T. Ishizuka H. Okazawa Y. Choi K. Nishijima M. Koshiba M. Yokoyama Y. Totsuka S. Chen Y. Heng Z. Yang H. Zhang D. Kielczewska P. Mijakowski K. Connolly M. Dziomba R. J. Wilkes
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keywords antineutrinosneutrinosparametersatmosphericdifferencesmixingoscillationsearch
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We present a search for differences in the oscillations of antineutrinos and neutrinos in the Super-Kamiokande -I, -II, and -III atmospheric neutrino sample. Under a two-flavor disappearance model with separate mixing parameters between neutrinos and antineutrinos, we find no evidence for a difference in oscillation parameters. Best fit antineutrino mixing is found to be at (dm2bar, sin2 2 thetabar) = (2.0x10^-3 eV^2, 1.0) and is consistent with the overall Super-K measurement.

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