{"paper":{"title":"Transition Form Factor gamma gamma* -> pi0 and QCD sum rules","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A.V. Radyushkin, R.T.Ruskov","submitted_at":"1996-03-26T04:19:42Z","abstract_excerpt":"The transition gamma*(q_1)gamma*(q_2) -> \\pi0(p) is studied within the QCD sum rule framework. As a first step, we analyze the kinematic situation when both photon virtualities are spacelike and large. We construct a QCD sum rule for F(q_1^2,q_2^2) and show that, in the asymptotic limit |q_1^2|, |q_2^2| \\to \\infty, it reproduces the leading-order pQCD result. Then we study the limit |q_1^2| -> 0, in which one of the photons is (almost) real. We develop a factorization procedure for the infrared singularities ln(q_1^2), 1/q_1^2,1/q_1^4,etc., emerging in this limit. The infrared-sensitive contri"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9603408","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"}