{"paper":{"title":"Systematic twist expansion of $(\\eta_c,\\eta_b)\\to\\gamma^*\\gamma$ transition form factors in light-front quark model","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Chueng-Ryong Ji (North Carolina State Univ.), Ho-Meoyng Choi (Kyungpook National Univ.), Hui-Young Ryu (Pusan National Univ.)","submitted_at":"2018-04-23T08:45:36Z","abstract_excerpt":"The light-front quark model analysis of the meson-photon transition form factor $F_{P\\gamma} (Q^2)$ amenable both for the spacelike region ($Q^2 >0$) and the timelike region ($Q^2 <0$) provides a systematic twist expansion of $Q^2 F_{P\\gamma} (Q^2)$ for the high $|Q^2|$ region. Investigating $F_{P\\gamma} (Q^2) (P = \\eta_c,\\eta_b)$ for the entire kinematic regions of $Q^2$, we examine the twist-2 and twist-3 distribution amplitudes of $(\\eta_c,\\eta_b)$ mesons in the light-front quark model and quantify their contributions to $Q^2 F_{(\\eta_c,\\eta_b)\\gamma}(Q^2)$. Our numerical results for the no"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.08287","kind":"arxiv","version":3},"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"}