Search for dinucleon decay into kaons in Super-Kamiokande

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 backgroun...

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Veröffentlicht in:	Physical review letters 2014-04, Vol.112 (13), p.131803-131803, Article 131803
Hauptverfasser:	Litos, M, Abe, K, Hayato, Y, Iida, T, Ikeda, M, Iyogi, K, Kameda, J, Kobayashi, K, Koshio, Y, Kozuma, Y, Miura, M, Moriyama, S, Nakahata, M, Nakayama, S, Obayashi, Y, Ogawa, H, Sekiya, H, Shiozawa, M, Suzuki, Y, Takeda, A, Takenaga, Y, Takeuchi, Y, Ueno, K, Ueshima, K, Watanabe, H, Yamada, S, Yokozawa, T, Hazama, S, Ishihara, C, Kaji, H, Kajita, T, Kaneyuki, K, McLachlan, T, Okumura, K, Shimizu, Y, Tanimoto, N, Vagins, M R, Kearns, E, Stone, J L, Sulak, L R, Dufour, F, Raaf, J L, Henning, B, Goldhaber, M, Bays, K, Casper, D, Cravens, J P, Kropp, W R, Mine, S, Regis, C, Smy, M B, Sobel, H W, Ganezer, K S, Hill, J, Keig, W E, Jang, J S, Kim, J Y, Lim, I T, Albert, J B, Wongjirad, T, Wendell, R, Scholberg, K, Walter, C W, Tasaka, S, Learned, J G, Matsuno, S, Watanabe, Y, Hasegawa, T, Ishida, T, Ishii, T, Kobayashi, T, Nakadaira, T, Nakamura, K, Nishikawa, K, Nishino, H, Oyama, Y, Sakashita, K, Sekiguchi, T, Tsukamoto, T, Suzuki, A T, Minamino, A, Nakaya, T, Fukuda, Y, Itow, Y, Mitsuka, G, Tanaka, T, Jung, C K, Lopez, G, McGrew, C, Terri, R, Yanagisawa, C, Tamura, N, Ishino, H, Kibayashi, A, Mino, S, Mori, T, Sakuda, M, Toyota, H, Kuno, Y, Yoshida, M
Format:	Artikel
Sprache:	eng
Schlagworte:	Atmospherics Decision trees Decomposition Kaons Neutrinos Searching Signal detection
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Zusammenfassung:	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''.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.112.131803