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Best description of pion transition form-factor (TFF) data is obtained with only tiny violations of one of the relations in the minimal consistent set of short-distance constraints on the anomalous R\\chi L couplings. eta^{(')} TFF, predicted in terms of the pi TFF and the eta-eta^' mixing, are in good agreement with measurements. With this input, we obtain a_mu^{P,LbL} = (10.47\\pm0.5"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1409.2174","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2014-09-07T23:31:35Z","cross_cats_sorted":[],"title_canon_sha256":"0f122cdf938bf9b1299e0f2d646e41e5581607d389b90e72cf00ecb249ca4c5d","abstract_canon_sha256":"fcd01643a23a4d40dded492b2ac879af04af7488634ff165a2db5c94289a49c8"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:43:08.852066Z","signature_b64":"El1J6NVJ/51zCzWERC1qNnzibBIi8Uh34Qr0DaN4Z0/fXBXWYKb85NaPy1/hiJOGkISB/x61nmftLuVIBDSEBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d05750007badedbcfd4b814a03e0bffde998d81d027a972920484bd6e7fa3cf9","last_reissued_at":"2026-05-18T02:43:08.851538Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:43:08.851538Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Lightest pseudoscalar exchange contribution to light-by-light scattering piece of the muon g-2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Adolfo Guevara, Gabriel L\\'opez Castro, Pablo Roig","submitted_at":"2014-09-07T23:31:35Z","abstract_excerpt":"Lightest pseudoscalar (P= pi^0, eta, eta') exchange contribution to the light-by-light (LbL) scattering piece of the muon anomaly, a_mu=(g_mu-2)/2, has been evaluated using a resonance chiral Lagrangian (R\\chi L). Best description of pion transition form-factor (TFF) data is obtained with only tiny violations of one of the relations in the minimal consistent set of short-distance constraints on the anomalous R\\chi L couplings. eta^{(')} TFF, predicted in terms of the pi TFF and the eta-eta^' mixing, are in good agreement with measurements. 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