{"paper":{"title":"Experimental Study of Rare Kaon Decays at J-PARC with KOTO and KOTO II","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. Gianoli, A. Glazov, A. Mazzolari, A. M. Iyer, A. Romano, A. Rostomyan, A. Shaikhiev, A. Sytov, A. Tomczak, B. Stillwell, C. Kim, C. Lazzeroni, C. Lin, D. Martinez Santos, D. Ogawa, D. Protopopescu, E. Augustine, E. Goudzovski, E. J. Kim, F. Brizioli, F. Mahmoudi, G. A. Carini, G. D'Ambrosio, G. Patern\\`o, G. Yang, G. Y. Lim, H. Nanjo, H. Watanabe, J. B. Dainton, J. Bian, J. K. Ahn, J. Redeker, J. Swallow, K. Kotera, K. Massri, K.Ono, K. Shiomi, L. Bandiera, L. Malagutti, L. Peruzzo, M. Gonzalez, M. Homma, M. Kreps, M. Moulson, M. Pepe, M. Romagnoni, M. Soldani, N. Canale, P. Fedeli, R. Negrello, R. Shiraishi, R. Wanke, S. De Capua, S. Lim, S. Neshatpour, T. Husek, T. K. Komatsubara, T.Matsumura, T. Nomura, T. Yamanaka, V. Chobanova, Y. B. Hsiung, Y. C. Tung, Y. Tajima, Y. W. Wah","submitted_at":"2025-05-05T11:20:21Z","abstract_excerpt":"The rare kaon decay $K_L\\to\\pi^0\\nu\\bar{\\nu}$ is extremely sensitive to new physics, because the contribution to this decay in the Standard Model (SM) is highly suppressed and known very accurately; the branching ratio is $3\\times 10^{-11}$ in the SM with a theoretical uncertainty of just 2%. The measurement of this branching ratio could provide essential new information about the flavor structure of the quark sector from the $s\\to d$ transition. The decay is being searched for in the KOTO experiment at J-PARC, which has obtained the current best upper limit on the branching ratio of $2.2\\time"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2505.02568","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2505.02568/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}