Neutron-Antineutron Oscillation Search using a 0.37 Megaton$\cdot$Year Exposure of Super-Kamiokande

Journal Article (Academic article)

As a baryon number violating process with $\Delta B=2$, 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 $\tau_{n\to\bar n} > 4.7\times10^{8}$~s at 90\% C.L..

Full Text

Duke Authors

Cited Authors

  • Collaboration, S-K; Abe, K; Bronner, C; Hayato, Y; Ikeda, M; Imaizumi, S; Ito, H; Kameda, J; Kataoka, Y; Miura, M; Moriyama, S; Nagao, Y; Nakahata, M; Nakajima, Y; Nakayama, S; Okada, T; Okamoto, K; Orii, A; Pronost, G; Sekiya, H; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Yano, T; Akutsu, R; Han, S; Kajita, T; Okumura, K; Tashiro, T; Wang, R; Xia, J; Bravo-Berguño, D; Labarga, L; Marti, L; Zaldivar, B; Blaszczyk, FDM; Kearns, E; Gustafson, JD; Raaf, JL; Stone, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Mine, S; Smy, MB; Sobel, HW; Takhistov, V; Weatherly, P; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Coffani, A; Drapier, O; Hedri, SE; Giampaolo, A; Gonin, M; Mueller, TA; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Anthony, LHV; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; Rosa, GD; Collazuol, G; Iacob, F; Lamoureux, M; Ospina, N; Ludovici, L; Nishimura, Y; Cao, S; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Matsubara, T; Nakadaira, T; Jakkapu, M; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Nakano, Y; Shiozawa, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Ali, A; Ashida, Y; Feng, J; Hirota, S; Ichikawa, AK; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Fernandez, P; McCauley, N; Mehta, P; Pritchard, A; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Niwa, T; Sato, K; Tsukada, M; Mijakowski, P; Posiadala-Zezula, M; Jung, CK; Vilela, C; Wilking, MJ; Yanagisawa, C; Harada, M; Hagiwara, K; Horai, T; Ishino, H; Ito, S; Koshio, Y; Ma, W; Piplani, N; Sakai, S; Kuno, Y; Barr, G; Barrow, D; Cook, L; Goldsack, A; Samani, S; Simpson, C; Wark, D; Nova, F; Boschi, T; Lodovico, FD; Sedgwick, SM; Taani, M; Zsoldos, S; Yang, JY; Jenkins, SJ; McElwee, JM; Thiesse, MD; Thompson, LF; Malek, M; Stone, O; Okazawa, H; Kim, SB; Yu, I; Nishijima, K; Koshiba, M; Ogawa, N; Iwamoto, K; Yokoyama, M; Martens, K; Vagins, MR; Kuze, M; Izumiyama, S; Tanaka, M; Yoshida, T; Inomoto, M; Ishitsuka, M; Matsumoto, R; Ohta, K; Shinoki, M; Martin, JF; Tanaka, HA; Towstego, T; Hartz, M; Konaka, A; Perio, PD; Prouse, NW; Pointon, BW; Chen, S; Xu, BD; Richards, B; Jamieson, B; Walker, J; Minamino, A; Pintaudi, G; Sasaki, R

Published Date

  • December 4, 2020