We searched for bound neutron decay via n → nu_bar + 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 × 10^32 years on the neutron lifetime at a 90% confidence level.
Search for neutron decay into an antineutrino and a neutral kaon in 0.401 megaton-years exposure of Super-Kamiokande / Yamauchi, K.; Abe, K.; Abe, S.; Asaoka, Y.; Harada, M.; Hayato, Y.; Hiraide, K.; Hosokawa, K.; Ieki, K.; Ikeda, M.; 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, B. w.; Yanagisawa, C.; Kearns, E.; Mirabito, J.; Wan, L.; Wester, T.; Bian, J.; Cortez, B.; Griskevich, N. j.; Jiang, Y.; Smy, M. b.; Sobel, H. w.; Takhistov, V.; Yankelevich, A.; Hill, J.; Jang, M. c.; Lee, S. h.; Moon, D. h.; Park, R. g.; Yang, B. s.; Bodur, B.; Scholberg, K.; Walter, C. w.; Beauchêne, A.; Drapier, O.; Ershova, A.; Mueller, Th. a.; Santos, A. d.; Paganini, P.; Quach, C.; Rogly, R.; Nakamura, T.; Jang, J. s.; Litchfield, R. p.; Machado, L. n.; Soler, F. j. p.; Learned, J. g.; Choi, K.; Iovine, N.; Tiwari, D.; Cao, S.; Anthony, L. h. v.; Martin, D.; Prouse, N. w.; Scott, M.; Uchida, Y.; Berardi, V.; Calabria, N. f.; Catanesi, M. g.; Ospina, N.; Radicioni, E.; Langella, A.; De Rosa, G.; Collazuol, G.; Feltre, M.; Mattiazzi, M.; Ludovici, L.; Gonin, M.; Périssé, L.; Quilain, B.; Horiuchi, S.; Kawabata, A.; Kobayashi, M.; Liu, Y. m.; 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.; Portocarrero Yrey, A.; Sakashita, K.; Sekiguchi, T.; Tsukamoto, T.; Bhuiyan, N.; Burton, G. t.; Di Lodovico, F.; Gao, J.; Katori, T.; Kralik, R.; Migenda, J.; Ramsden, R. m.; Zsoldos, S.; Ito, H.; Sone, T.; Suzuki, A. t.; Takagi, Y.; Takeuchi, Y.; Wada, S.; Zhong, H.; Feng, J.; Feng, L.; Han, S.; Hikida, J.; Hu, J. r.; Hu, Z.; Kawaue, M.; Kikawa, T.; Nakaya, T.; Ngoc, T. v.; Wendell, R. a.; Yasutome, K.; Jenkins, S. j.; Mccauley, N.; Tarrant, A.; Fanì, M.; Wilking, M. j.; 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, J. y.; Yoo, J.; Fannon, J. e. p.; Kneale, L.; Malek, M.; Mcelwee, J. m.; Peacock, T.; Stowell, P.; Thiesse, M. d.; Thompson, L. f.; Wilson, S. t.; Okazawa, H.; Lakshmi, S. m.; Kwon, E.; Lee, M. w.; Seo, J. w.; Yu, I.; Ichikawa, A. k.; Nakamura, K. d.; 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.; Jesús-Valls, C.; Martens, K.; Marti, Ll.; Tsui, K. m.; Vagins, M. r.; 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, B. r.; Chen, S.; Wu, Y.; Xu, B. d.; Zhang, A. q.; Zhang, B.; Girgus, M.; Govindaraj, P.; Posiadala-Zezula, M.; Prabhu, Y. s.; Boyd, S. b.; 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.; Shimamura, R.; Null, Null. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - ELETTRONICO. - 112:9(2025). [10.1103/thqt-8fp1]
Search for neutron decay into an antineutrino and a neutral kaon in 0.401 megaton-years exposure of Super-Kamiokande
Berardi, V.Membro del Collaboration Group
;Calabria, N. F.;
2025
Abstract
We searched for bound neutron decay via n → nu_bar + 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 × 10^32 years on the neutron lifetime at a 90% confidence level.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

