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Search for Rare Kaon Decays at the J-PARC KOTO Experiment

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Moscow University Physics Bulletin Aims and scope

Abstract

The KOTO experiment at the J-PARC 30-GeV Main Ring is dedicated to search for the rare decay \(K_{L}\to\pi^{0}\nu\overline{\nu}\). This mode directly breaks the CP symmetry and is highly suppressed in the Standard Model (SM). In addition, the theoretical uncertainties on the decay is only a few percent. Those features make this decay one of the best probes to search for new physics beyond the SM. We have been accumulating physics data since 2013 and we had finalized the analysis with the dataset taken in 2016–2018. In the analysis, we found charged kaons contained in the neutral beam could become a serious background source. Thus, we have installed a new counter to detect the charged kaons and resumed physics data taking. In this parper, we report the results of the 2016–2018 analysis and the status of recent data taking.

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Authors and Affiliations

  1. Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), 305-0801, Ibaraki, Tsukuba, Japan

    Koji Shiomi

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  1. Koji Shiomi
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KOTO Collaboration

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Correspondence to Koji Shiomi.

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The authors declare that they have no conflicts of interest.

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Shiomi, K., KOTO Collaboration. Search for Rare Kaon Decays at the J-PARC KOTO Experiment. Moscow Univ. Phys. 77, 254–259 (2022). https://doi.org/10.3103/S0027134922020916

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  • DOI: https://doi.org/10.3103/S0027134922020916

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