Search for proton decay via p-->e+pi0 and p-->micro+pi0 in a large water Cherenkov detector.

  title={Search for proton decay via p-->e+pi0 and p-->micro+pi0 in a large water Cherenkov detector.},
  author={H Nishino and S. T. Clark and Ke. Abe and Y. Hayato and Takashi Iida and Motoyasu Ikeda and Jun Kameda and K. Kobayashi and Yusuke Koshio and Makoto Miura and S. Moriyama and M. Nakahata and Shoei Nakayama and Yoshihisa Obayashi and Hiroshi Ogawa and Hiroyuki Sekiya and Masato Shiozawa and Y. Suzuki and Atsushi Takeda and Yumiko Takenaga and Y. Takeuchi and Keiji Ueno and Kota Ueshima and Hiroshi Watanabe and Shinya Yamada and S. Hazama and I. Higuchi and Chizue Ishihara and Takaaki Kajita and Kenji Kaneyuki and Gaku Mitsuka and Kimihiro Okumura and Naho Tanimoto and Mark Robert Vagins and Fr{\'e}d{\'e}ric Dufour and Edward Kearns and M. D. Litos and J L Raaf and J. L. Stone and L. R. Sulak and Wei Wang and Maurice Goldhaber and Steven Dazeley and Robert C. Svoboda and Kirk Bays and D. W. Casper and J. P. Cravens and William R. Kropp and Shun'ichi Mine and Christopher Regis and Michael Burghard Smy and Henry W. Sobel and Kenneth Samuel Ganezer and J. Colin Hill and William E. Keig and J. S. Jang and J. Y. Kim and I. T. Lim and Maximilien Fechner and Kate Scholberg and C. W. Walter and R. A. Wendell and Shigeki Tasaka and John G. Learned and Shigenobu Matsuno and Y. X. Watanabe and Takehisa Hasegawa and Taku Ishida and Tomoyuki Ishii and Tooru Kobayashi and Takeshi Nakadaira and K Nakamura and Koichiro Nishikawa and Yuichi Oyama and Ken Sakashita and T. Sekiguchi and Toshifumi Tsukamoto and Atsuto Suzuki and A. Minamino and Tsuyoshi Nakaya and M. Yokoyama and Yoshiyuki Fukuda and Yoshitaka Itow and T. Tanaka and Chang Kee Jung and G. D́ıaz L{\'o}pez and C. Mcgrew and Ryan Terri and C. Yanagisawa and Norio Tamura and Y. Idehara and Makoto Sakuda and Yoshitaka Kuno and Minoru Yoshida and S. B. Kim and B. S. Yang and Takeharu Ishizuka and Hiromu Okazawa and Y. K. Choi and Hyunkwan Seo and Yuichi Furuse and Kyoshi Nishijima and Y. Yokosawa and Masatoshi Koshiba and Yoji Totsuka and Shenjian Chen and Yuekun. Heng and Z. Yang and H. Zhang and Danuta Kiełczewska and Eric Thrane and R. J. Wilkes},
  journal={Physical review letters},
  volume={102 14},
We have searched for proton decays via p-->e;{+}pi;{0} and p-->micro;{+}pi;{0} using data from a 91.7 kt.yr exposure of Super-Kamiokande-I and a 49.2 kt.yr exposure of Super-Kamiokande-II. No candidate events were observed with expected backgrounds induced by atmospheric neutrinos of 0.3 events for each decay mode. From these results, we set lower limits on the partial lifetime of 8.2 x 10;{33} and 6.6 x 10;{33} years at 90% confidence level for p-->e;{+}pi;{0} and p-->micro;{+}pi;{0} modes… 

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