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Search for dinucleon decay into pions at Super-Kamiokande

  • J. Gustafson
  • , K. Abe
  • , Y. Haga
  • , Y. Hayato
  • , M. Ikeda
  • , K. Iyogi
  • , J. Kameda
  • , Y. Kishimoto
  • , M. Miura
  • , S. Moriyama
  • , M. Nakahata
  • , T. Nakajima
  • , Y. Nakano
  • , S. Nakayama
  • , A. Orii
  • , H. Sekiya
  • , M. Shiozawa
  • , A. Takeda
  • , H. Tanaka
  • , T. Tomura
  • R. A. Wendell, T. Irvine, T. Kajita, I. Kametani, K. Kaneyuki, Y. Nishimura, E. Richard, K. Okumura, L. Labarga, P. Fernandez, S. Berkman, H. A. Tanaka, S. Tobayama, E. Kearns, J. L. Raaf, J. L. Stone, L. R. Sulak, M. Goldhaber, G. Carminati, W. R. Kropp, S. Mine, P. Weatherly, A. Renshaw, M. B. Smy, H. W. Sobel, V. Takhistov, K. S. Ganezer, B. L. Hartfiel, J. Hill, N. Hong, J. Y. Kim, I. T. Lim, T. Akiri, A. Himmel, K. Scholberg, C. W. Walter, T. Wongjirad, T. Ishizuka, S. Tasaka, J. S. Jang, J. G. Learned, S. Matsuno, S. N. Smith, T. Hasegawa, T. Ishida, T. Ishii, T. Kobayashi, T. Nakadaira, K. Nakamura, Y. Oyama, K. Sakashita, T. Sekiguchi, T. Tsukamoto, A. T. Suzuki, Y. Takeuchi, T. Yano, S. Hirota, K. Huang, K. Ieki, T. Kikawa, A. Minamino, T. Nakaya, K. Suzuki, S. Takahashi, Y. Fukuda, K. Choi, Y. Itow, G. Mitsuka, T. Suzuki, P. Mijakowski, J. Hignight, J. Imber, C. K. Jung, J. L. Palomino, C. Yanagisawa, H. Ishino, T. Kayano, A. Kibayashi, Y. Koshio, T. Mori, M. Sakuda, Y. Kuno, R. Tacik, S. B. Kim, H. Okazawa, Y. Choi, K. Nishijima, M. Koshiba, Y. Suda, Y. Totsuka, M. Yokoyama, C. Bronner, K. Martens, Ll Marti, Y. Suzuki, M. R. Vagins, J. F. Martin, P. De Perio, A. Konaka, M. J. Wilking, S. Chen, Y. Zhang, R. J. Wilkes
  • Boston University
  • The University of Tokyo
  • Universidad Autónoma de Madrid
  • University of British Columbia
  • Brookhaven National Laboratory
  • University of California at Irvine
  • California State University Dominguez Hills
  • Chonnam National University
  • Duke University
  • Fukuoka Institute of Technology
  • Gifu University
  • Gwangju Institute of Science and Technology
  • University of Hawai'i at Mānoa
  • High Energy Accelerator Research Organization, Tsukuba
  • Kobe University
  • Kyoto University
  • Miyagi University of Education
  • Nagoya University
  • National Centre for Nuclear Research
  • Stony Brook University
  • Okayama University
  • The University of Osaka
  • University of Regina
  • TRIUMF
  • Seoul National University
  • Shizuoka University of Welfare
  • Sungkyunkwan University
  • Tokai University
  • University of Toronto
  • Tsinghua University
  • University of Washington

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

A search for dinucleon decay into pions with the Super-Kamiokande detector has been performed with an exposure of 282.1 kiloton-years. Dinucleon decay is a process that violates baryon number by two units. We present the first search for dinucleon decay to pions in a large water-Cherenkov detector. The modes O16(pp)→C14π+π+, O16(pn)→N14π+π0, and O16(nn)→O14π0π0 are investigated. No significant excess in the Super-Kamiokande data has been found, so a lower limit on the lifetime of the process per oxygen nucleus is determined. These limits are τpp→π+π+>7.22×1031years, τpn→π+π0>1.70×1032years, and τnn→π0π0>4.04×1032years. The lower limits on each mode are about 2 orders of magnitude better than previous limits from searches for dinucleon decay in iron.

Original languageEnglish
Article number072009
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume91
Issue number7
DOIs
StatePublished - Apr 28 2015

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