{"paper":{"title":"Observation of a $\\bar{K}NN$ bound state in the $^3{\\rm He} (K^-, \\Lambda p)n$ reaction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"nucl-ex","authors_text":"A. Sakaguchi, A. Scordo, A. Toyoda, C. Curceanu, C. Guaraldo, D. Sirghi, D. Tomono, E. Widmann, F. Sakuma, F. Sirghi, G. Beer, H. Asano, H. Bhang, H. Fujioka, H. Kou, H. Noumi, H. Ohnishi, H. Outa, H. Shi, H. Tatsuno, H. Yim, J. Marton, J. Zmeskal, K. Inoue, K. Itahashi, K. Kanno, K. Kato, K. Piscicchia, K. Shirotori, K. Tanida, K. Tsukada, L. Busso, M. Bragadireanu, M. Cargnelli, M. Iio, M. Iliescu, M. Iwai, M. Iwasaki, M. Sato, M. Sekimoto, M. Tokuda, O. Morra, O. Vazquez Doce, P. Buehler, P. Kienle, Q. Zhang, R. S. Hayano, S. Ajimura, S. Choi, S. Enomoto, S. Ishimoto, S. Kawasaki, S. Okada, S. Suzuki, T. Fukuda, T. Hashimoto, T. Hiraiwa, T. Ishikawa, T. Nagae, T. Suzuki, T. Yamaga, T. Yamazaki, Y. Fujiwara, Y. Ishiguro, Y. Kato, Y. Ma, Y. Matsuda, Y. Mizoi, Y. Sada","submitted_at":"2020-06-24T02:38:15Z","abstract_excerpt":"We have performed an exclusive measurement of the $K^{-}+\\! ~^{3}{\\rm He} \\to \\Lambda pn$ reaction at an incident kaon momentum of $1\\ {\\rm GeV}/c$.In the $\\Lambda p$ invariant mass spectrum, a clear peak was observed below the mass threshold of $\\bar{K}\\!+\\!N\\!+\\!N$, as a signal of the kaonic nuclear bound state, $\\bar{K}NN$.The binding energy, decay width, and $S$-wave Gaussian reaction form-factor of this state were observed to be $B_{K} = 42\\pm3({\\rm stat.})^{+3}_{-4}({\\rm syst.})\\ {\\rm MeV}$, $\\Gamma_{K} = 100\\pm7({\\rm stat.})^{+19}_{-9}({\\rm syst.})\\ {\\rm MeV}$, and $Q_{K} = 383\\pm11({\\r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2006.13433","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/2006.13433/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"}