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

作者：K. Yamauchi, K Abe, S. Abe, Y. Asaoka, M. Harada, Y. Hayato, K Hiraide, K. Hosokawa, K. Ieki, Makoto Ikeda, J. Kameda, Yonehiro Kanemura, Y. Kataoka, Shigeyuki Miki, S Mine, M Miura, S Moriyama, M. Nakahata, S Nakayama, Y. Noguchi, G. Pronost, K. Sato, H. Sekiya, K. Shimizu, R Shinoda, M Shiozawa, Yuya Suzuki, A. Takeda, Yasuhiko Takemoto, Hidekazu Tanaka, T. Yano, Y Itow, T. Kajita, Ryo Nishijima, K. Okumura, T. Tashiro, T. Tomiya, Xiaogang Wang, P. Fernández, L. Labarga, D Samudio, Bryan Zaldívar, B. W. Pointon, C. Yanagisawa, E. Kearns, J. Mirabito, L. Wan, T. Wester, J. M. Bian, B. Cortez, N.J Griskevich, Y. Jiang, M. B. Smy, H. Sobel, Volodymyr Takhistov, A. Yankelevich, J. Hill, M. C. Jang, S. H. Lee, D.H Moon, R. G. Park, B. S. Yang, B. Bodur, K Scholberg, C. W. Walter, A Beauchêne, O. Drapier, A. Ershova, Th. A. Mueller, A. De Souza Santos, P. Paganini, Caroline Quach, R. Rogly, T. Nakamura, J. S. Jang, R. P. Litchfield, L. N. Machado, F. J. P. Soler, J. G. Learned, K. Choi, Nadege Iovine, Deepak Tiwari, S. Cao, L. H. V. Anthony, D. Martin, N. W. Prouse, M Scott, Y Uchida, V. Berardi, N.F Calabria, M G Catanesi, N. Ospina, E. Radicioni, A. Langella, G. De Rosa, G Collazuol, M Feltre, M Mattiazzi, L Ludovici, M. Gonin, Lorenzo Périssé, B. Quilain, Shunsaku Horiuchi, A Kawabata, M. Kobayashi, Y. M. Liu, Y Maekawa, Y. Nishimura, Ryuji Okazaki, R Akutsu, M. Friend, T. Hasegawa, Y. Hino, T. Ishida, T. Kobayashi, M Jakkapu, T. Matsubara, T Nakadaira, K. Nakamura, Y Oyama, A. Portocarrero Yrey, K Sakashita, T. Sekiguchi, T Tsukamoto, N. A. Bhuiyan, G. T. Burton, F. Di Lodovico, J. Gao, T. Katori, R. Kralik, J. Migenda, R. M. Ramsden, S. Zsoldos, Hiroshi Itô, T. Sone, A. T. Suzuki, Y. Takagi, Y. Takeuchi, S. Wada, H. Zhong, J. Feng, L. Feng, S. Han, J Hikida, Jun Hu, Z. Hu, M Kawaue, T. Kikawa, T. Nakaya, T. V. Ngoc, R. A. Wendell, K. Yasutome, S. J. Jenkins, N. McCauley, A. Tarrant, M. Fanì, M. J. Wilking, Z. Xie, Y. Fukuda, H. Menjo, Yumiko Yoshioka, J. Lagoda, M. Mandal, J. Zalipska, M. Mori, Meng Jia, J. Jiang, W. Shi, K. Hamaguchi, H. Ishino, Y. Koshio, F. Nakanishi, S. Sakai, T. Tada, T. Tano, T. Ishizuka, G. Barr, D. Barrow, L Cook, S. Samani, D. Wark, A. Holin, F. Nova, S. Jung, J. Y. Yang, J. Yoo, J. E. P. Fannon, L. Kneale, M. Malek, J. M. McElwee, Tim Peacock, P. Stowell, M. D. Thiesse, L. F. Thompson, Stephen T. Wilson, H. Okazawa, S.M Lakshmi, E. Kwon, M. W. Lee, J. W. Seo, I. Yu, A. K. Ichikawa, K. Nakamura, S. Tairafune, A. Eguchi, S. Goto, S. Kodama, Y. Mizuno, Takayuki Muro, K. Nakagiri, Y. Nakajima, N. Taniuchi, E. Watanabe, M. Yokoyama, P. de Perio, S. Fujita, C. Jesús-Valls, K Martens, Ll. Marti, K. M. Tsui, M.R Vagins, J. Xia, S. Izumiyama, M. Kuze, R. Matsumoto, K. Terada, R. Asaka, M Ishitsuka, M. Shinoki, Mitsuru Sugo, M. Wako, T. Yoshida, Y. Nakano, F. Cormier, R Gaur, V. Gousy-Leblanc, M. Hartz, A. Konaka, X. Li, B. R. Smithers, S Chen, B.D Xu, B. D. Xu, A. Q. Zhang, Bin Zhang, M Girgus, P. Govindaraj, M. Posiadała-Zezula, Y. S. Prabhu, S. B. Boyd, R. Edwards, D. Hadley, M. Nicholson, M. O’Flaherty, B. Richards, A. Ali, B Jamieson, S. Amanai, C. Bronner, D. Horiguchi, A. Minamino, Yuka Sasaki, R. Shibayama, Ryota Shimamura · 发表于：Physical review. D/Physical review. D. · 年份：2025 · DOI：10.1103/thqt-8fp1 · 被引用次数：2 · 研究领域：Atomic and Subatomic Physics Research、Radiation Detection and Scintillator Technologies、Neutrino Physics Research

We searched for bound neutron decay via n → ν ¯ + K 0 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 × 10 32 years on the neutron lifetime at a 90% confidence level.