Neutron-Antineutron Oscillation Search using a 0.37 Megaton$\cdot$Year Exposure of Super-Kamiokande
Creators: name: Kamiokande Collaboration
name: Abe, K.
name: Bronner, C.
name: Hayato, Y.
name: Ikeda, M.
name: Imaizumi, S.
name: Ito, H.
name: Kameda, J.
name: Kataoka, Y.
name: Miura, M.
name: Moriyama, S.
name: Nagao, Y.
name: Nakahata, M.
name: Nakajima, Y.
name: Nakayama, S.
name: Okada, T.
name: Okamoto, K.
name: Orii, A.
name: Pronost, G.
name: Sekiya, H.
name: Shiozawa, M.
name: Sonoda, Y.
name: Suzuki, Y.
name: Takeda, A.
name: Takemoto, Y.
name: Takenaka, A.
name: Tanaka, H.
name: Yano, T.
name: Akutsu, R.
name: Han, S.
name: Kajita, T.
name: Okumura, K.
name: Tashiro, T.
name: Wang, R.
name: Xia, J.
name: Bravo-Berguño, D.
name: Labarga, L.
name: Marti, Ll.
name: Zaldivar, B.
name: Blaszczyk, F. d. M.
name: Kearns, E.
name: Gustafson, J. D.
name: Raaf, J. L.
name: Stone, J. L.
name: Wan, L.
name: Wester, T.
name: Bian, J.
name: Griskevich, N. J.
name: Kropp, W. R.
name: Locke, S.
name: Mine, S.
name: Smy, M. B.
name: Sobel, H. W.
name: Takhistov, V.
name: Weatherly, P.
name: Hill, J.
name: Kim, J. Y.
name: Lim, I. T.
name: Park, R. G.
name: Bodur, B.
name: Scholberg, K.
name: Walter, C. W.
name: Coffani, A.
name: Drapier, O.
name: Hedri, S. El
name: Giampaolo, A.
name: Gonin, M.
name: Mueller, Th. A.
name: Paganini, P.
name: Quilain, B.
name: Ishizuka, T.
name: Nakamura, T.
name: Jang, J. S.
name: Learned, J. G.
name: Anthony, L. H. V.
name: Sztuc, A. A.
name: Uchida, Y.
name: Berardi, V.
name: Catanesi, M. G.
name: Radicioni, E.
name: Calabria, N. F.
name: Machado, L. N.
name: De Rosa, G.
name: Collazuol, G.
name: Iacob, F.
name: Lamoureux, M.
name: Ospina, N.
name: Ludovici, L.
name: Nishimura, Y.
name: Cao, S.
name: Friend, M.
name: Hasegawa, T.
name: Ishida, T.
name: Kobayashi, T.
name: Matsubara, T.
name: Nakadaira, T.
name: Jakkapu, M.
name: Nakamura, K.
name: Oyama, Y.
name: Sakashita, K.
name: Sekiguchi, T.
name: Tsukamoto, T.
name: Nakano, Y.
name: Shiozawa, T.
name: Suzuki, A. T.
name: Takeuchi, Y.
name: Yamamoto, S.
name: Ali, A.
name: Ashida, Y.
name: Feng, J.
name: Hirota, S.
name: Ichikawa, A. K.
name: Kikawa, T.
name: Mori, M.
name: Nakaya, T.
name: Wendell, R. A.
name: Yasutome, K.
name: Fernandez, P.
name: McCauley, N.
name: Mehta, P.
name: Pritchard, A.
name: Tsui, K. M.
name: Fukuda, Y.
name: Itow, Y.
name: Menjo, H.
name: Niwa, T.
name: Sato, K.
name: Tsukada, M.
name: Mijakowski, P.
name: Posiadala-Zezula, M.
name: Jung, C. K.
name: Vilela, C.
name: Wilking, M. J.
name: Yanagisawa, C.
name: Harada, M.
name: Hagiwara, K.
name: Horai, T.
name: Ishino, H.
name: Ito, S.
name: Koshio, Y.
name: Ma, W.
name: Piplani, N.
name: Sakai, S.
name: Kuno, Y.
name: Barr, G.
name: Barrow, D.
name: Cook, L.
name: Goldsack, A.
name: Samani, S.
name: Simpson, C.
name: Wark, D.
name: Nova, F.
name: Boschi, T.
name: Di Lodovico, F.
name: Sedgwick, S. Molina
name: Taani, M.
name: Zsoldos, S.
name: Yang, J. Y.
name: Jenkins, S. J.
name: McElwee, J. M.
name: Thiesse, M. D.
name: Thompson, L. F.
name: Malek, M.
name: Stone, O.
name: Okazawa, H.
name: Kim, S. B.
name: Yu, I.
name: Nishijima, K.
name: Koshiba, M.
name: Ogawa, N.
name: Iwamoto, K.
name: Yokoyama, M.
name: Martens, K.
name: Vagins, M. R.
name: Kuze, M.
name: Izumiyama, S.
name: Tanaka, M.
name: Yoshida, T.
name: Inomoto, M.
name: Ishitsuka, M.
name: Matsumoto, R.
name: Ohta, K.
name: Shinoki, M.
name: Martin, J. F.
name: Tanaka, H. A.
name: Towstego, T.
name: Hartz, M.
name: Konaka, A.
name: de Perio, P.
name: Prouse, N. W.
name: Pointon, B. W.
name: Chen, S.
name: Xu, B. D.
name: Richards, B.
name: Jamieson, B.
name: Walker, J.
name: Minamino, A.
name: Okamoto, K.
name: Pintaudi, G.
name: Sasaki, R.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: As a baryon number violating process with $ΔB=2$, neutron-antineutron oscillation ($n\to\bar n$) provides a unique test of baryon number conservation. We have performed a search for $n\to\bar n$ oscillation with bound neutrons in Super-Kamiokande, with the full data set from its first four run periods, representing an exposure of 0.37~Mton-years. The search used a multivariate analysis trained on simulated $n\to\bar n$ events and atmospheric neutrino backgrounds and resulted in 11 candidate events with an expected background of 9.3 events. In the absence of statistically significant excess, we derived a lower limit on $\bar n$ appearance lifetime in $^{16}$O nuclei of $3.6\times{10}^{32}$ years and on the neutron-antineutron oscillation time of $τ_{n\to\bar n} &gt; 4.7\times10^{8}$~s at 90\% C.L..