Search for Proton Decay via p→e⁺π⁰ and p→μ⁺π⁰ in a Large Water Cherenkov Detector

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H. Nishino², S. Clark⁴, K. Abe¹, Y. Hayato^1,3, T. Iida¹, M. Ikeda¹, J. Kameda¹, K. Kobayashi¹, Y. Koshio¹, M. Miura¹, S. Moriyama^1,3, M. Nakahata^1,3, S. Nakayama¹, Y. Obayashi¹, H. Ogawa¹, H. Sekiya¹, M. Shiozawa^1,3, Y. Suzuki^1,3, A. Takeda¹, Y. Takenaga¹, Y. Takeuchi^1,3, K. Ueno¹, K. Ueshima¹, H. Watanabe¹, S. Yamada¹, S. Hazama², I. Higuchi², C. Ishihara², T. Kajita^2,3, K. Kaneyuki^2,3, G. Mitsuka², K. Okumura², N. Tanimoto², M. R. Vagins^3,7, F. Dufour⁴, E. Kearns^4,3, M. Litos⁴, J. L. Raaf⁴, J. L. Stone^4,3, L. R. Sulak⁴, W. Wang⁴, M. Goldhaber⁵, S. Dazeley⁶, R. Svoboda⁶, K. Bays⁷, D. Casper⁷, J. P. Cravens⁷, W. R. Kropp⁷, S. Mine⁷, C. Regis⁷, M. B. Smy^7,3, H. W. Sobel^7,3, K. S. Ganezer⁸, J. Hill⁸, W. E. Keig⁸, J. S. Jang⁹, J. Y. Kim⁹, I. T. Lim⁹, M. Fechner¹⁰, K. Scholberg^10,3, C. W. Walter^10,3, R. Wendell¹⁰, S. Tasaka¹¹, J. G. Learned¹², S. Matsuno¹², Y. Watanabe¹³, T. Hasegawa¹⁴, T. Ishida¹⁴, T. Ishii¹⁴, T. Kobayashi¹⁴, T. Nakadaira¹⁴, K. Nakamura^14,3, K. Nishikawa¹⁴, Y. Oyama¹⁴, K. Sakashita¹⁴, T. Sekiguchi¹⁴, T. Tsukamoto¹⁴, A. T. Suzuki¹⁵, A. Minamino¹⁶, T. Nakaya^16,3, M. Yokoyama¹⁶, Y. Fukuda¹⁷, Y. Itow¹⁸, T. Tanaka¹⁸, C. K. Jung¹⁹, G. Lopez¹⁹, C. McGrew¹⁹, R. Terri¹⁹, C. Yanagisawa¹⁹, N. Tamura²⁰, Y. Idehara²¹, M. Sakuda²¹, Y. Kuno²², M. Yoshida²², S. B. Kim²³, B. S. Yang²³, T. Ishizuka²⁴, H. Okazawa²⁵, Y. Choi²⁶, H. K. Seo²⁶, Y. Furuse²⁷, K. Nishijima²⁷, Y. Yokosawa²⁷, M. Koshiba²⁸, Y. Totsuka^28,*, S. Chen²⁹, Y. Heng²⁹, Z. Yang²⁹, H. Zhang²⁹, D. Kielczewska³⁰, E. Thrane³¹, and R. J. Wilkes³¹ (Super-Kamiokande Collaboration)
¹Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Kamioka, Gifu 506-1205, Japan
²Research Center for Cosmic Neutrinos, Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan
³Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, Chiba 277-8582, Japan
⁴Department of Physics, Boston University, Boston, Massachusetts 02215, USA
⁵Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA
⁶Department of Physics, University of California, Davis, Davis, California 95616, USA
⁷Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697-4575, USA
⁸Department of Physics, California State University, Dominguez Hills, Carson, California 90747, USA
⁹Department of Physics, Chonnam National University, Kwangju 500-757, Korea
¹⁰Department of Physics, Duke University, Durham North Carolina 27708, USA
¹¹Department of Physics, Gifu University, Gifu, Gifu 501-1193, Japan
¹²Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822, USA
¹³Physics Division, Department of Engineering, Kanagawa University, Kanagawa, Yokohama 221-8686, Japan
¹⁴High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
¹⁵Department of Physics, Kobe University, Kobe, Hyogo 657-8501, Japan
¹⁶Department of Physics, Kyoto University, Kyoto, Kyoto 606-8502, Japan
¹⁷Department of Physics, Miyagi University of Education, Sendai, Miyagi 980-0845, Japan
¹⁸Solar Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8602, Japan
¹⁹Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800, USA
²⁰Department of Physics, Niigata University, Niigata, Niigata 950-2181, Japan
²¹Department of Physics, Okayama University, Okayama, Okayama 700-8530, Japan
²²Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
²³Department of Physics, Seoul National University, Seoul 151-742, Korea
²⁴Department of Systems Engineering, Shizuoka University, Hamamatsu, Shizuoka 432-8561, Japan
²⁵Department of Informatics in Social Welfare, Shizuoka University of Welfare, Yaizu, Shizuoka, 425-8611, Japan
²⁶Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea
²⁷Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
²⁸The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
²⁹Department of Engineering Physics, Tsinghua University, Beijing, 100084, China
³⁰Institute of Experimental Physics, Warsaw University, 00-681 Warsaw, Poland
³¹Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA

^*Deceased.