Search for neutron decay into an antineutrino and a neutral kaon in 0.401 megaton-years exposure of Super-Kamiokande

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Yamauchi, K, Abe, K, Abe, S, Asaoka, Y, Harada, M, Hayato, Y, Hiraide, K, Hosokawa, K, Ieki, K, Ikeda, M et al (show 254 more authors) , Kameda, J, Kanemura, Y, Kataoka, Y, Miki, S, Mine, S, Miura, M, Moriyama, S, Nakahata, M, Nakayama, S, Noguchi, Y, Pronost, G, Sato, K, Sekiya, H, Shimizu, K, Shinoda, R, Shiozawa, M, Suzuki, Y, Takeda, A, Takemoto, Y, Tanaka, H, Yano, T, Itow, Y, Kajita, T, Nishijima, R, Okumura, K, Tashiro, T, Tomiya, T, Wang, X, Fernandez, P, Labarga, L, Samudio, D, Zaldivar, B, Pointon, BW, Yanagisawa, C, Kearns, E, Mirabito, J, Wan, L, Wester, T, Bian, J, Cortez, B, Griskevich, NJ, Jiang, Y, Smy, MB, Sobel, HW, Takhistov, V, Yankelevich, A, Hill, J, Jang, MC, Lee, SH, Moon, DH, Park, RG, Yang, BS, Bodur, B, Scholberg, K, Walter, CW, Beauchene, A, Drapier, O, Ershova, A, Mueller, Th A, Santos, AD, Paganini, P, Quach, C, Rogly, R, Nakamura, T, Jang, JS, Litchfield, RP, Machado, LN, Soler, FJP, Learned, JG, Choi, K, Iovine, N, Tiwari, D, Cao, S, Anthony, LHV, Martin, D, Prouse, NW, Scott, M, Uchida, Y, Berardi, V, Calabria, NF, Catanesi, MG, Ospina, N, Radicioni, E, Langella, A, De Rosa, G, Collazuol, G, Feltre, M, Mattiazzi, M, Ludovici, L, Gonin, M, Periss, L, Quilain, B, Horiuchi, S, Kawabata, A, Kobayashi, M, Liu, YM, Maekawa, Y, Nishimura, Y, Okazaki, R, Akutsu, R, Friend, M, Hasegawa, T, Hino, Y, Ishida, T, Kobayashi, T, Jakkapu, M, Matsubara, T, Nakadaira, T, Nakamura, K, Oyama, Y, Yrey, A Portocarrero, Sakashita, K, Sekiguchi, T, Tsukamoto, T, Bhuiyan, N, Burton, GT, Di Lodovico, F, Gao, J, Katori, T, Kralik, R, Migenda, J, Ramsden, RM, Zsoldos, S, Ito, H, Sone, T, Suzuki, AT, Takagi, Y, Takeuchi, Y, Wada, S, Zhong, H, Feng, J, Feng, L, Han, S, Hikida, J, Hu, JR, Hu, Z, Kawaue, M, Kikawa, T, Nakaya, T, Ngoc, TV, Wendell, RA, Yasutome, K, Jenkins, SJ, McCauley, N ORCID: 0000-0002-5982-5125, Tarrant, A, Fani, M, Wilking, MJ, Xie, Z, Fukuda, Y, Menjo, H, Yoshioka, Y, Lagoda, J, Mandal, M, Zalipska, J, Mori, M, Jia, M, Jiang, J, Shi, W, Hamaguchi, K, Ishino, H, Koshio, Y, Nakanishi, F, Sakai, S, Tada, T, Tano, T, Ishizuka, T, Barr, G, Barrow, D, Cook, L, Samani, S, Wark, D, Holin, A, Nova, F, Jung, S, Yang, JY, Yoo, J, Fannon, JEP, Kneale, L, Malek, M, McElwee, JM, Peacock, T, Stowell, P, Thiesse, MD, Thompson, LF, Wilson, ST, Okazawa, H, Lakshmi, SM, Kwon, E, Lee, MW, Seo, JW, Yu, I, Ichikawa, AK, Nakamura, KD, Tairafune, S, Eguchi, A, Goto, S, Kodama, S, Mizuno, Y, Muro, T, Nakagiri, K, Nakajima, Y, Taniuchi, N, Watanabe, E, Yokoyama, M, De Perio, P, Fujita, S, Jesus-Valls, C, Martens, K, Marti, Ll, Tsui, KM, Vagins, MR, Xia, J, Izumiyama, S, Kuze, M, Matsumoto, R, Terada, K, Asaka, R, Ishitsuka, M, Shinoki, M, Sugo, M, Wako, M, Yoshida, T, Nakano, Y, Cormier, F, Gaur, R, Gousy-Leblanc, V, Hartz, M, Konaka, A, Li, X, Smithers, BR, Chen, S, Wu, Y, Xu, BD, Zhang, AQ, Zhang, B, Girgus, M, Govindaraj, P, Posiadala-Zezula, M, Prabhu, YS, Boyd, SB, Edwards, R, Hadley, D, Nicholson, M, O'Flaherty, M, Richards, B, Ali, A, Jamieson, B, Amanai, S, Bronner, C, Horiguchi, D, Minamino, A, Sasaki, Y, Shibayama, R and Shimamura, R (2025) Search for neutron decay into an antineutrino and a neutral kaon in 0.401 megaton-years exposure of Super-Kamiokande PHYSICAL REVIEW D, 112 (9). pp. 1-13. ISSN 2470-0010, 2470-0029

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Abstract

We searched for bound neutron decay via n → ν̄ + K⁰ predicted by the grand unified theories in 0.401 Mton · years exposure of all pure water phases in the Super-Kamiokande detector. About 4.4 times more data than in the previous search have been analyzed by a new method including a spectrum fit to kaon invariant mass distributions. No significant data excess has been observed in the signal regions. As a result of this analysis, we set a lower limit of 7.8 × 10³² years on the neutron lifetime at a 90% confidence level.

Item Type:	Article
Uncontrolled Keywords:	5106 Nuclear and Plasma Physics, 51 Physical Sciences
Divisions:	Faculty of Science & Engineering Faculty of Science & Engineering > School of Physical Sciences Faculty of Science & Engineering > School of Physical Sciences > Physics
Depositing User:	Symplectic Admin
Date Deposited:	19 Nov 2025 10:29
Last Modified:	16 Jun 2026 06:28
DOI:	10.1103/thqt-8fp1
Open Access URL:	https://journals.aps.org/prd/abstract/10.1103/thqt...
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3195497
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