{"paper":{"title":"Two Photon Transition Form Factor of $\\bar{c}c $ Quarkonia","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph"],"primary_cat":"nucl-th","authors_text":"Jing Chen, Lei Chang, Minghui Ding, Yu-Xin Liu","submitted_at":"2016-11-18T03:17:35Z","abstract_excerpt":"The two photon transition of $\\bar{c}c$ quarkonia are studied within a covariant approach based on the consistent truncation scheme of the quantum chromodynamics Dyson-Schwinger equation for the quark propagator and the Bethe--Salpeter equation for the mesons. We find the decay widths of $\\eta_{c}^{} \\to \\gamma\\gamma$ and $\\chi_{c0,2}^{} \\to \\gamma\\gamma$ in good agreement with experimental data. The obtained transition form factor of $\\eta_{c}^{} \\to \\gamma\\gamma^{\\ast}$ for a wide range of space-like photon momentum transfer squared is also in agreement with the experimental findings of the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1611.05960","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"}