{"paper":{"title":"Observation of a 1750 MeV/c^2 Enhancement in the Diffractive Photoproduction of K^+K^-","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"FOCUS collaboration","submitted_at":"2002-08-17T14:10:49Z","abstract_excerpt":"Using the FOCUS spectrometer with photon beam energies between 20 and 160 \\gev, we confirm the existence of a diffractively photoproduced enhancement in $K^+K^-$ at 1750 \\mevcc with nearly 100 times the statistics of previous experiments. Assuming this enhancement to be a single resonance with a Breit-Wigner mass shape, we determine its mass to be $1753.5\\pm 1.5\\pm 2.3$ \\mevcc and its width to be $122.2\\pm 6.2\\pm 8.0$ \\mevcc. We find no corresponding enhancement at 1750 \\mevcc in $K^*K$, and again neglecting any possible interference effects we place limits on the ratio $\\Gamma (X(1750) \\to K^"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0208027","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":""},"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"}