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Phys Rev Lett. 2014 Apr 4;112(13):131803. Epub 2014 Apr 4.

Search for dinucleon decay into kaons in Super-Kamiokande.

Author information

1
Department of Physics, Boston University, Boston, Massachusetts 02215, USA.
2
Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Kamioka, Gifu 506-1205, Japan.
3
Kamioka Observatory, Institute for Cosmic Ray Research, University of Tokyo, Kamioka, Gifu 506-1205, Japan and Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa, Chiba 277-8583, Japan.
4
Research Center for Cosmic Neutrinos, Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan.
5
Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa, Chiba 277-8583, Japan and Research Center for Cosmic Neutrinos, Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan.
6
Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa, Chiba 277-8583, Japan and Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697-4575, USA.
7
Department of Physics, Boston University, Boston, Massachusetts 02215, USA and Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa, Chiba 277-8583, Japan.
8
Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
9
Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697-4575, USA.
10
Department of Physics, California State University, Dominguez Hills, Carson, California 90747, USA.
11
Department of Physics, Chonnam National University, Kwangju 500-757, Korea.
12
Department of Physics, Duke University, Durham, North Carolina 27708, USA.
13
Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa, Chiba 277-8583, Japan and Department of Physics, Duke University, Durham, North Carolina 27708, USA.
14
Department of Physics, Gifu University, Gifu, Gifu 501-1193, Japan.
15
Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822, USA.
16
Physics Division, Department of Engineering, Kanagawa University, Kanagawa, Yokohama 221-8686, Japan.
17
High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
18
Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa, Chiba 277-8583, Japan and High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
19
Department of Physics, Kobe University, Kobe, Hyogo 657-8501, Japan.
20
Department of Physics, Kyoto University, Kyoto, Kyoto 606-8502, Japan.
21
Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa, Chiba 277-8583, Japan and Department of Physics, Kyoto University, Kyoto, Kyoto 606-8502, Japan.
22
Department of Physics, Miyagi University of Education, Sendai, Miyagi 980-0845, Japan.
23
Solar Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8602, Japan.
24
Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800, USA.
25
Department of Physics, Niigata University, Niigata, Niigata 950-2181, Japan.
26
Department of Physics, Okayama University, Okayama, Okayama 700-8530, Japan.
27
Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan.
28
Department of Physics, Seoul National University, Seoul 151-742, Korea.
29
Department of Systems Engineering, Shizuoka University, Hamamatsu, Shizuoka 432-8561, Japan.
30
Department of Informatics in Social Welfare, Shizuoka University of Welfare, Yaizu, Shizuoka 425-8611, Japan.
31
Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea.
32
Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan.
33
The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan.
34
Department of Engineering Physics, Tsinghua University, Beijing 100084, China.
35
Institute of Experimental Physics, Warsaw University, 00-681 Warsaw, Poland.
36
Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA.

Abstract

A search for the dinucleon decay pp → K+ K+ has been performed using 91.6  kton·yr data from Super-Kamiokande-I. This decay provides a sensitive probe of the R-parity-violating parameter λ112''. A boosted decision tree analysis found no signal candidates in the data. The expected background was 0.28±0.19 atmospheric neutrino induced events and the estimated signal detection efficiency was 12.6%±3.2%. A lower limit of 1.7×10(32)  years has been placed on the partial lifetime of the decay O16 → C14K+ K+ at 90% C.L. A corresponding upper limit of 7.8×10(-9) has been placed on the parameter λ112''.

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