{"paper":{"title":"Improved Measurement of the Branching Fraction and Energy Spectrum of eta' from Upsilon(1S) Decays","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"CLEO Collaboration, et al, O. Aquines","submitted_at":"2006-10-11T15:39:07Z","abstract_excerpt":"We present an improved measurement of the $\\eta'$ meson energy spectrum in $\\Upsilon(1S)$ decays, using 1.2 fb^{-1} of data taken at the $\\Upsilon(1S)$ center-of-mass energy with the CLEO III detector. We compare our results with models of the $\\eta'$ gluonic form factor that have been suggested to explain the unexpectedly large $B\\to \\eta 'X_s$ rate. Models based on perturbative QCD fail to fit the data for large $\\eta '$ energies, and thus an explanation outside the realm of the Standard Model or an improved understanding of non-perturbative QCD effects may be needed to account for this larg"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ex/0610032","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":""},"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"}