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

A search for proton decay via p → l + + X , where l + is a positively charged lepton and X is an invisible, massless, neutral particle, was performed using a 401 kton · 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 1.72 × 10 33 years for p → e + + X and 0.61 × 10 33 years for p → μ + + X at the 90% confidence level. These results improve on previous limits by factors of 2 and 1.5, respectively.

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Journal
Physical review. D/Physical review. D.
Published
2026-10-13
DOI
https://doi.org/10.1103/rsr5-d3x2
Primary Topic
Neutrino Physics Research
Type
article
Field-Weighted Citation Impact
0.00

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article

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

Y. M. Liu, K. Ieki, N. J. Griskevich, T. Tomiya et al.
Physical review. D/Physical review. D.
Neutrino Physics Research
article

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

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

Abstract

A search for proton decay via p → l + + X , where l + is a positively charged lepton and X is an invisible, massless, neutral particle, was performed using a 401 kton · 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 1.72 × 10 33 years for p → e + + X and 0.61 × 10 33 years for p → μ + + X at the 90% confidence level. These results improve on previous limits by factors of 2 and 1.5, respectively.

Physical review. D/Physical review. D.Vol. 114(7)
Boston University (US), Chonnam National University (KR), University of Hawaiʻi at Mānoa (US), California State University System (US), TRIUMF (CA), University of Hawaii System (US), University of Padua (IT), High Energy Accelerator Research Organization (JP), Duke University (US), British Columbia Institute of Technology (CA), City University of New York (US), Keio University (JP), University of California, Irvine (US), Gwangju Institute of Science and Technology (KR), Institute for Basic Science (KR), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Bari (IT), International Centre for Interdisciplinary Science and Education (VN), Laboratoire Leprince-Ringuet (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Roma I (IT), University of Chinese Academy of Sciences (CN), Gifu University (JP), Institute of Science Tokyo (JP), Imperial College London (GB), Stony Brook University (US), Nagoya University (JP), Universidad Autónoma de Madrid (ES), Polytechnic University of Bari (IT), The University of Tokyo (JP), University of Glasgow (GB), Sapienza University of Rome (IT), Tsinghua University (CN)
National Science Foundation, U.S. Department of Energy, European Commission, Ministry of Education, Culture, Sports, Science and Technology, National Natural Science Foundation of China, Ministry of Education, National Research Foundation of Korea, Narodowe Centrum Nauki, Ministerstwo Edukacji i Nauki, Institute for Basic Science, Ministry of Science and ICT, South Korea, Horizon 2020 Framework Programme, Natural Sciences and Engineering Research Council of Canada, Science and Technology Facilities Council, Japan Society for the Promotion of Science, Instituto Nazionale di Fisica Nucleare, Nuclear Physics, NextGenerationEU
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Neutrino Physics Research
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