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Search for proton decay via $p \to μ^{+} K^{0}$ in Super-Kamiokande I, II, and III

C. Regis⁶, K. Abe¹, Y. Hayato^1,28, K. Iyogi¹, J. Kameda¹, Y. Koshio¹, Ll. Marti¹, M. Miura¹, S. Moriyama^1,28 et al. (The Super-Kamiokande Collaboration)

S. Moriyama^1,28, M. Nakahata^1,28, S. Nakayama¹, Y. Obayashi¹, H. Sekiya¹, M. Shiozawa^1,28, Y. Suzuki^1,28, A. Takeda¹, Y. Takenaga¹, K. Ueno¹, T. Yokozawa¹, H. Kaji², T. Kajita^2,28, K. Kaneyuki^2,28,*, K. P. Lee², K. Okumura², T. McLachlan², L. Labarga³, E. Kearns^4,28, J. L. Raaf⁴, J. L. Stone^4,28, L. R. Sulak⁴, M. Goldhaber^5,*, K. Bays⁶, G. Carminati⁶, W. R. Kropp⁶, S. Mine⁶, A. Renshaw⁶, M. B. Smy^6,28, H. W. Sobel^6,28, K. S. Ganezer⁷, J. Hill⁷, W. E. Keig⁷, J. S. Jang^8,†, J. Y. Kim⁸, I. T. Lim⁸, J. B. Albert⁹, K. Scholberg^9,28, C. W. Walter^9,28, R. A. Wendell⁹, T. Wongjirad⁹, T. Ishizuka¹⁰, S. Tasaka¹¹, J. G. Learned¹², S. Matsuno¹², S. N. Smith¹², T. Hasegawa¹³, T. Ishida¹³, T. Ishii¹³, T. Kobayashi¹³, T. Nakadaira¹³, K. Nakamura^13,28, K. Nishikawa¹³, Y. Oyama¹³, K. Sakashita¹³, T. Sekiguchi¹³, T. Tsukamoto¹³, A. T. Suzuki¹⁴, Y. Takeuchi^14,28, K. Ieki¹⁵, M. Ikeda¹⁵, H. Kubo¹⁵, A. Minamino¹⁵, A. Murakami¹⁵, T. Nakaya^15,28, Y. Fukuda¹⁶, K. Choi¹⁷, Y. Itow^17,18, G. Mitsuka¹⁷, M. Miyake¹⁷, P. Mijakowski¹⁹, J. Hignight²⁰, J. Imber²⁰, C. K. Jung²⁰, I. Taylor²⁰, C. Yanagisawa²⁰, H. Ishino²¹, A. Kibayashi²¹, T. Mori²¹, M. Sakuda²¹, J. Takeuchi²¹, Y. Kuno²², S. B. Kim²³, H. Okazawa²⁴, Y. Choi²⁵, K. Nishijima²⁶, M. Koshiba²⁷, Y. Totsuka^27,*, M. Yokoyama^27,28, K. Martens²⁸, M. R. Vagins^28,6, S. Chen²⁹, H. Sui²⁹, Z. Yang²⁹, H. Zhang²⁹, K. Connolly³⁰, M. Dziomba³⁰, and R. J. Wilkes³⁰ (The 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
³Department of Theoretical Physics, University Autonoma Madrid, 28049 Madrid, Spain
⁴Department of Physics, Boston University, Boston, Massachusetts 02215, USA
⁵Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA
⁶Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697-4575, USA
⁷Department of Physics, California State University, Dominguez Hills, Carson, California 90747, USA
⁸Department of Physics, Chonnam National University, Kwangju 500-757, Korea
⁹Department of Physics, Duke University, Durham, North Carolina 27708, USA
¹⁰Junior College, Fukuoka Institute of Technology, Fukuoka, Fukuoka 811-0295, Japan
¹¹Department of Physics, Gifu University, Gifu, Gifu 501-1193, Japan
¹²Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822, USA
¹³High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
¹⁴Department of Physics, Kobe University, Kobe, Hyogo 657-8501, Japan
¹⁵Department of Physics, Kyoto University, Kyoto, Kyoto 606-8502, Japan
¹⁶Department of Physics, Miyagi University of Education, Sendai, Miyagi 980-0845, Japan
¹⁷Solar Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8602, Japan
¹⁸Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Nagoya, Aichi 464-8602, Japan
¹⁹National Centre for Nuclear Research, 00-681 Warsaw, Poland
²⁰Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800, USA
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 Informatics in Social Welfare, Shizuoka University of Welfare, Yaizu, Shizuoka, 425-8611, Japan
²⁵Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea
²⁶Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan
²⁷The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
²⁸Kavli Institute for the Physics and Mathematics of the Universe (WPI), Todai Institutes for Advanced Study, University of Tokyo, Kashiwa, Chiba 277-8583, Japan
²⁹Department of Engineering Physics, Tsinghua University, Beijing, 100084, China
³⁰Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA

^*Deceased.
^†Present address: GIST College, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea.

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Phys. Rev. D 86, 012006 – Published 23 July, 2012

DOI: https://doi.org/10.1103/PhysRevD.86.012006

Abstract

We have searched for proton decay via $p \to μ^{+} K^{0}$ using data from a $91.7 kiloton \cdot year$ exposure of Super-Kamiokande- I, a $49.2 kiloton \cdot year$ exposure of Super-Kamiokande II, and a $31.9 kiloton \cdot year$ exposure of Super-Kamiokande III. The number of candidate events in the data was consistent with the atmospheric neutrino background expectation and no evidence for proton decay in this mode was found. We set a partial lifetime lower limit of $1.6 \times 10^{33} years$ at the 90% confidence level.

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References (25)

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Search for proton decay via $p \to μ^{+} K^{0}$ in Super-Kamiokande I, II, and III

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Search for proton decay via p→μ+K0 in Super-Kamiokande I, II, and III

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Search for proton decay via $p \to μ^{+} K^{0}$ in Super-Kamiokande I, II, and III