{"paper":{"title":"Wide-angle photoproduction of the $\\eta'$-meson and its gluon content","license":"http://creativecommons.org/licenses/by-sa/4.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Kornelija Passek-Kumeri\\v{c}ki, Peter Kroll","submitted_at":"2021-11-17T08:18:23Z","abstract_excerpt":"We investigate wide-angle photoproduction of the $\\eta'$ meson within the handbag approach to twist-3 accuracy. It turns out that, due to the gluon content of the $\\eta'$, this process is dominated by twist-2 in contrast with pion and $\\eta$ photoproduction. Using the presently available information on the twist-2 and twist-3 distribution amplitudes and on the $\\eta - \\eta'$ mixing, we provide prediction for the $\\eta'$ cross section and helicity correlations. It is argued that $\\eta'$ photoproduction is well suited to improve our knowledge of the two-gluon distribution amplitude."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2111.08965","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/2111.08965/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"}