{"paper":{"title":"Evidence for a $\\bar{K}NN$ quasi-bound state in the $\\gamma d \\to K^0\\Lambda p$ reaction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. O. Tokiyasu, C. Rangacharyulu, C. Yoshida, H. Katsuragawa, H. Kohri, H. Ohkuma, H. Ohnishi, H. Shimizu, J. K. Ahn, K. Mizutani, K. Watanabe, M.-L. Chu, M. Miyabe, M. Niiyama, M. Sumihama, M. Yosoi (LEPS2/Solenoid Collaboration), N. Muramatsu, N. Tomida, R. Kobayakawa, S. Ajimura, S. Dat\\'e, S. Suzuki, S. Tanaka, S. Y. Ryu, T. A. Hashimoto, T. Gogami, T. H. Nam, T. Hotta, T. Ishikawa, T. Nakano, T. Ohta, T. Yorita, W.-C. Chang, Y. Ma, Y. Nozawa, Y. Ohashi, Y. Sada","submitted_at":"2026-06-15T06:04:28Z","abstract_excerpt":"The $\\gamma d \\to K^{0}\\Lambda p$ reaction has been studied to search for a $\\bar{K}NN$ quasi-bound state using the LEPS2 solenoid spectrometer at SPring-8. A localized enhancement concentrated at low $q$ is observed in the $(M_{\\Lambda p},q)$ distribution below the $K^-pp$ mass threshold, where $M_{\\Lambda p}$ is the $\\Lambda p$ invariant mass and $q \\equiv |\\vec{p}_{\\gamma}-\\vec{p}_{K^{0}}| = |\\vec{p}_{\\Lambda p}|$ is the momentum transfer. A two-dimensional $(M_{\\Lambda p},q)$ fit demonstrates that the enhancement near the threshold is statistically significant, yielding a local significanc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.16258","kind":"arxiv","version":2},"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/2606.16258/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"}