{"paper":{"title":"Hard exclusive two photon processes in QCD","license":"http://creativecommons.org/licenses/by/3.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Simon I. Eidelman, Victor L. Chernyak","submitted_at":"2014-09-11T08:21:21Z","abstract_excerpt":"This is a short review of some hard two-photon processes: $\\\\ a) \\,\\,\\gamma\\gamma\\to {\\overline P}_1 P_2,\\,\\, {\\overline P}_1 P_2= \\{\\pi^+\\pi^-, K^+ K^-, K_S K_S, \\pi^o\\pi^o, \\pi^o\\eta\\}\\,, \\\\ b) \\,\\,\\gamma\\gamma\\to V_1 V_2,\\,\\, V_1 V_2=\\{\\rho^o\\rho^o, \\phi\\phi, \\omega\\phi, \\omega\\omega \\},\\\\ c) \\,\\,\\gamma\\gamma\\to {\\rm baryon-antibaryon},\\\\ d) \\,\\,\\gamma^*\\gamma\\to P^o,\\,\\, P^o=\\{\\pi^o, \\eta, \\eta^\\prime, \\eta_c\\}$.\n  The available experimental data are presented. A number of theoretical approaches to calculation of these processes is described, both those based mainly on QCD and more phenome"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1409.3348","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"}