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arXiv · 2208.13188

Search for proton decay via $p\rightarrow \mu^+K^0$ in 0.37 megaton-years exposure of Super-Kamiokande

Kamiokande Collaboration·R. Matsumoto·K. Abe·Y. Hayato·K. Hiraide·K. Ieki·M. Ikeda·J. Kameda·Y. Kanemura·R. Kaneshima·Y. Kashiwagi·Y. Kataoka·S. Miki·S. Mine·M. Miura·S. Moriyama·Y. Nakano·M. Nakahata·S. Nakayama·Y. Noguchi·K. Okamoto·K. Sato·H. Sekiya·H. Shiba·K. Shimizu·M. Shiozawa·Y. Sonoda·Y. Suzuki·A. Takeda·Y. Takemoto·A. Takenaka·H. Tanaka·S. Watanabe·T. Yano·S. Han·T. Kajita·K. Okumura·T. Tashiro·T. Tomiya·X. Wang·J. Xia·S. Yoshida·G. D. Megias·P. Fernandez·L. Labarga·N. Ospina·B. Zaldivar·B. W. Pointon·E. Kearns·J. L. Raaf·L. Wan·T. Wester·J. Bian·N. J. Griskevich·W. R. Kropp·S. Locke·M. B. Smy·H. W. Sobel·V. Takhistov·A. Yankelevich·J. Hill·J. Y. Kim·I. T. Lim·R. G. Park·B. Bodur·K. Scholberg·C. W. Walter·L. Bernard·A. Coffani·O. Drapier·S. El Hedri·A. Giampaolo·Th. A. Mueller·A. D. Santos·P. Paganini·B. Quilain·T. Ishizuka·T. Nakamura·J. S. Jang·J. G. Learned·K. Choi·S. Cao·L. H. V. Anthony·D. Martin·M. Scott·A. A. Sztuc·Y. Uchida·V. Berardi·M. G. Catanesi·E. Radicioni·N. F. Calabria·L. N. Machado·G. De Rosa·G. Collazuol·F. Iacob·M. Lamoureux·M. Mattiazzi·L. Ludovici·M. Gonin·G. Pronost
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Abstract

We searched for proton decay via $p\to\mu^+K^0$ in 0.37\,Mton$\cdot$years of data collected between 1996 and 2018 from the Super-Kamiokande water Cherenkov experiment. The selection criteria were defined separately for $K^0_S$ and $K^0_L$ channels. No significant event excess has been observed. As a result of this analysis, which extends the previous search by an additional 0.2\,Mton$\cdot$years of exposure and uses an improved event reconstruction, we set a lower limit of $3.6\times10^{33}$ years on the proton lifetime.

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Kamiokande Collaboration, R. Matsumoto, K. Abe, Y. Hayato, K. Hiraide, K. Ieki, M. Ikeda, J. Kameda, Y. Kanemura, R. Kaneshima, Y. Kashiwagi, Y. Kataoka, S. Miki, S. Mine, M. Miura, S. Moriyama, Y. Nakano, M. Nakahata, S. Nakayama, Y. Noguchi, K. Okamoto, K. Sato, H. Sekiya, H. Shiba, K. Shimizu, M. Shiozawa, Y. Sonoda, Y. Suzuki, A. Takeda, Y. Takemoto, A. Takenaka, H. Tanaka, S. Watanabe, T. Yano, S. Han, T. Kajita, K. Okumura, T. Tashiro, T. Tomiya, X. Wang, J. Xia, S. Yoshida, G. D. Megias, P. Fernandez, L. Labarga, N. Ospina, B. Zaldivar, B. W. Pointon, E. Kearns, J. L. Raaf, L. Wan, T. Wester, J. Bian, N. J. Griskevich, W. R. Kropp, S. Locke, M. B. Smy, H. W. Sobel, V. Takhistov, A. Yankelevich, J. Hill, J. Y. Kim, I. T. Lim, R. G. Park, B. Bodur, K. Scholberg, C. W. Walter, L. Bernard, A. Coffani, O. Drapier, S. El Hedri, A. Giampaolo, Th. A. Mueller, A. D. Santos, P. Paganini, B. Quilain, T. Ishizuka, T. Nakamura, J. S. Jang, J. G. Learned, K. Choi, S. Cao, L. H. V. Anthony, D. Martin, M. Scott, A. A. Sztuc, Y. Uchida, V. Berardi, M. G. Catanesi, E. Radicioni, N. F. Calabria, L. N. Machado, G. De Rosa, G. Collazuol, F. Iacob, M. Lamoureux, M. Mattiazzi, L. Ludovici, M. Gonin, G. Pronost. 2022-08-28. Search for proton decay via $p\rightarrow \mu^+K^0$ in 0.37 megaton-years exposure of Super-Kamiokande. https://arxiv.org/abs/2208.13188

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