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Dinucleon and Nucleon Decay to Two-Body Final States with no Hadrons in Super-Kamiokande

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arxiv 1811.12430 v1 pith:ZJOQ4QOC submitted 2018-11-29 hep-ex

Super-Kamiokande Collaboration: S. Sussman , K. Abe , C. Bronner , Y. Hayato , M. Ikeda , K. Iyogi , J. Kameda , Y. Kato
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Y. Kishimoto Ll. Marti M. Miura S. Moriyama T. Mochizuki M. Nakahata Y. Nakajima Y. Nakano S. Nakayama T. Okada K. Okamoto A. Orii G. Pronost H. Sekiya M. Shiozawa Y. Sonoda A. Takeda A. Takenaka H. Tanaka T. Yano R. Akutsu T. Kajita Y. Nishimura K. Okumura R. Wang J. Xia L. Labarga P. Fernandez F. d. M. Blaszczyk C. Kachulis E. Kearns J. L. Raaf J. L. Stone S. Berkman J. Bian N. J. Griskevich W. R. Kropp S. Locke S. Mine P. Weatherly M. B. Smy H. W. Sobel V. Takhistov K. S. Ganezer J. Hill J. Y. Kim I. T. Lim R. G. Park B. Bodur K. Scholberg C. W. Walter O. Drapier M. Gonin J. Imber Th. A. Mueller P. Paganini T. Ishizuka T. Nakamura J. S. Jang K. Choi J. G. Learned S. Matsuno R. P. Litchfield A. A. Sztuc Y. Uchida M. O. Wascko N. F. Calabria M. G. Catanesi R. A. Intonti E. Radicioni G. De Rosa A. Ali G. Collazuol F. Iacob L. Ludovici S. Cao M. Friend T. Hasegawa T. Ishida T. Kobayashi T. Nakadaira K. Nakamura Y. Oyama K. Sakashita T. Sekiguchi T. Tsukamoto KE. Abe M. Hasegawa Y. Isobe H. Miyabe T. Sugimoto A. T. Suzuki Y. Takeuchi Y. Ashida T. Hayashino S. Hirota M. Jiang T. Kikawa M. Mori KE. Nakamura T. Nakaya R. A. Wendell L. H. V. Anthony N. McCauley A. Pritchard K. M. Tsui Y. Fukuda Y. Itow M. Murrase P. Mijakowski K. Frankiewicz C. K. Jung X. Li J. L. Palomino G. Santucci C. Vilela M. J. Wilking C. Yanagisawa D. Fukuda K. Hagiwara H. Ishino S. Ito Y. Koshio M. Sakuda Y. Takahira C. Xu Y. Kuno C. Simpson D. Wark F. Di Lodovico B. Richards S. Molina Sedgwick R. Tacik S. B. Kim M. Thiesse L. Thompson H. Okazawa Y. Choi K. Nishijima M. Koshiba M. Yokoyama A. Goldsack K. Martens M. Murdoch B. Quilain Y. Suzuki M. R. Vagins M. Kuze Y. Okajima T. Yoshida M. Ishitsuka J. F. Martin C. M. Nantais H. A. Tanaka T. Towstego M. Hartz A. Konaka P. de Perio S. Chen L. Wan A. Minamino
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keywords modesdecaynucleondinucleonyearsfinalfivehadrons
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abstract

Using 0.37 megaton$\cdot$years of exposure from the Super-Kamiokande detector, we search for 10 dinucleon and nucleon decay modes that have a two-body final state with no hadrons. These baryon and lepton number violating modes have the potential to probe theories of unification and baryogenesis. For five of these modes the searches are novel, and for the other five modes we improve the limits by more than one order of magnitude. No significant evidence for dinucleon or nucleon decay is observed and we set lower limits on the partial lifetime of oxygen nuclei and on the nucleon partial lifetime that are above $4\times 10^{33}$ years for oxygen via the dinucleon decay modes and up to about $4 \times 10^{34}$ years for nucleons via the single nucleon decay modes.

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