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

Haruki Nishino, Scott T Clark, Kou Abe, Yoshinari Hayato, Takashi Iida, Motoyasu Ikeda, Jun Kameda, Kazuyoshi Ken Kobayashi, Yusuke Koshio, Makoto Miura, Shigetaka Moriyama, Masayuki Nakahata, Shoei Nakayama, Yoshihisa Obayashi, Hiroshi Ogawa, Hiroyuki Sekiya, Masato Shiozawa, Yoichiro Suzuki, Atsushi Takeda, Yumiko TakenagaYasuo Takeuchi, Koh Ueno, Kota Ueshima, Hiroko Watanabe, Satoru Yamada, S Hazama, Itaru Higuchi, Chizue Ishihara, Takaaki Kajita, Kenji Kaneyuki, Gaku Mitsuka, Kimihiro Okumura, Naho Tanimoto, Mark R Vagins, Fanny Dufour, Edward T Kearns, Michael Litos, Jennifer L Raaf, James L Stone, Lawrence R Sulak, Wenzhong Wang, Maurice Goldhaber, Steven Dazeley, Robert C Svoboda, K Bays, David William Casper, James P Cravens, William R Kropp, Shunichi Mine, Christopher Regis, Michael B Smy, Henry W Sobel, Kenneth S Ganezer, Jim Hill, William E Keig, Jeeseung Jang, Jaeyool Kim, Intaek Lim, Maximilien Fechner, Kate Scholberg, Christopher W Walter, Roger Alexandre Wendell, Shigeki Tasaka, John G Learned, Shige Matsuno, Yasushi Watanabe, Takuya Hasegawa, Taku Ishida, Takanobu Ishii, Tetsuya Kobayashi, Takeshi Nakadaira, Kenzo Nakamura, Koichiro Nishikawa, Yuichi Oyama, Ken Sakashita, Tetsuro Sekiguchi, Toshifumi Tsukamoto, Atsumu Suzuki, Akihiro Minamino, Tsuyoshi Nakaya, Masashi Yokoyama, Yoshiyuki Fukuda, Yoshitaka Itow, Takayuki Tanaka, Chang Kee Jung, Glenn Lopez, Clark McGrew, Ryan Vincent Terri, Chiaki Yanagisawa, Norio Tamura, Y Idehara, Makoto Sakuda, Yoshitaka Kuno, Makoto Yoshida, Soo-Bong Kim, Bong Seob Yang, Takeharu Ishizuka, Young-Il Choi, Hyun Kwan Seo, Y Furuse, Kyoshi Nishijima, Y Yokosawa, Masatoshi Koshiba, Yoji Totsuka, Shaomin Chen, Y Heng, Zhenwei Yang, Huayi Zhang, Danuta Kielczewska, Eric Thrane, R Jeffrey Wilkes

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102 Citations (Scopus)

Abstract

We have searched for proton decays via p -> e(+)pi(0) and p ->mu(+)pi(0) using data from a 91.7 kt center dot yr exposure of Super-Kamiokande-I and a 49.2 kt center dot 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 8.2x10(33) and 6.6x10(33) years at 90 confidence level for p -> e(+)pi(0) and p ->mu(+)pi(0) modes, respectively.
Original languageEnglish
Pages (from-to)1 - 5
Number of pages5
JournalPhysical Review Letters
Volume102
Issue number14
DOIs
Publication statusPublished - 2009
Externally publishedYes

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