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arXiv · 2608.30361

Search for proton decay into a single charged antilepton and a massless invisible particle using the full pure water data set of Super-Kamiokande

Kamiokande Collaboration·Y. M. Liu·K. Terada·K. Abe·Y. Asaoka·M. Harada·Y. Hayato·K. Hiraide·T. H. Hung·K. Ieki·M. Ikeda·J. Kameda·Y. Kataoka·S. Mine·M. Miura·S. Moriyama·K. Nakagiri·M. Nakahata·S. Nakayama·Y. Noguchi·G. Pronost·K. Sato·H. Sekiya·R. Shinoda·M. Shiozawa·Y. Suzuki·A. Takeda·Y. Takemoto·H. Tanaka·S. Chen·Y. Itow·T. Kajita·R. Nishijima·K. Okumura·T. Tashiro·T. Tomiya·X. Wang·F. J. de Garay Arcones·P. Fernandez·L. Labarga·D. Samudio·C. Yanagisawa·B. Jargowsky·E. Kearns·J. Mirabito·L. Wan·T. Wester·B. W. Pointon·J. Bian·B. Cortez·N. J. Griskevich·Y. Jiang·M. B. Smy·H. W. Sobel·V. Takhistov·J. Hill·B. D. Xu·D. Jung·D. H. Moon·R. G. Park·B. S. Yang·K. Scholberg·C. W. Walter·O. Drapier·A. Ershova·M. Ferey·Z. Hu·E. ~Le Blévec·T. Leplumey·Th. A. Mueller·P. Paganini·C. Quach·R. Rogly·T. Nakamura·J. S. Jang·R. P. Litchfield·L. N. Machado·F. J. P. Soler·J. G. Learned·K. Choi·S. Cao·T. V. Ngoc·L. H. V. Anthony·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. T. Burton·G. Collazuol·M. Feltre·M. Mattiazzi·L. Ludovici·M. Gonin·L. Périssé
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Abstract

A search for proton decay via $p\rightarrow l^{+}+X$, where $l^{+}$ is a positively charged lepton and $X$ is an invisible, massless, neutral particle, was performed using a 401~kton$\cdot$years exposure representing the entire pure water phase of Super-Kamiokande. No significant indication of a proton decay was observed beyond the expected atmospheric neutrino background. Lower limits on the partial lifetime of the proton were set to at $1.72\times10^{33}$ years for $p\rightarrow e^{+}+X$ and $0.61\times10^{33}$ years for $p\rightarrow \mu^{+}+X$ at the $90\%$ confidence level. These results improve on previous limits by factors of 2 and 1.5, respectively.

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Kamiokande Collaboration, Y. M. Liu, K. Terada, K. Abe, Y. Asaoka, M. Harada, Y. Hayato, K. Hiraide, T. H. Hung, K. Ieki, M. Ikeda, J. Kameda, Y. Kataoka, S. Mine, M. Miura, S. Moriyama, K. Nakagiri, M. Nakahata, S. Nakayama, Y. Noguchi, G. Pronost, K. Sato, H. Sekiya, R. Shinoda, M. Shiozawa, Y. Suzuki, A. Takeda, Y. Takemoto, H. Tanaka, S. Chen, Y. Itow, T. Kajita, R. Nishijima, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, F. J. de Garay Arcones, P. Fernandez, L. Labarga, D. Samudio, C. Yanagisawa, B. Jargowsky, E. Kearns, J. Mirabito, L. Wan, T. Wester, B. W. Pointon, J. Bian, B. Cortez, N. J. Griskevich, Y. Jiang, M. B. Smy, H. W. Sobel, V. Takhistov, J. Hill, B. D. Xu, D. Jung, D. H. Moon, R. G. Park, B. S. Yang, K. Scholberg, C. W. Walter, O. Drapier, A. Ershova, M. Ferey, Z. Hu, E. ~Le Blévec, T. Leplumey, Th. A. Mueller, P. Paganini, C. Quach, R. Rogly, T. Nakamura, J. S. Jang, R. P. Litchfield, L. N. Machado, F. J. P. Soler, J. G. Learned, K. Choi, S. Cao, T. V. Ngoc, L. H. V. Anthony, 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. T. Burton, G. Collazuol, M. Feltre, M. Mattiazzi, L. Ludovici, M. Gonin, L. Périssé. 2026-08-31. Search for proton decay into a single charged antilepton and a massless invisible particle using the full pure water data set of Super-Kamiokande. https://arxiv.org/abs/2608.30361

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