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We consider perturbative and non-perturbative contributions, working up to dimension five on the OPE. The vertices were studied considering that each one of its three mesons are off-shell alternately. The vertex coupling constant is evaluated through the extrapolation of the three different form factors. The results obtained for the coupling constants are $g_{\\eta_c D^* D} = 5.23^{+1.80}_{-1.38}$ and $g_{\\eta_c D_s^*\n  D_s}=5.5"},"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":"1707.02330","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2017-07-07T18:45:54Z","cross_cats_sorted":[],"title_canon_sha256":"990a0a333e2347f248b1c1d833c0a19276f3be3ccab326d61317a1ca8d7c8830","abstract_canon_sha256":"af009167ada6d2661111b63f2b06808eaad4e083ce49f8f0588876d2071cbaf6"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:09:20.212838Z","signature_b64":"IcyjgMzn1JAjUQPM3CpJYxM69PKCfitNIAxWWUvHzRzrbPSOlGorP6gBrFpF2bjqX7lmkWdvQBObDb9/PAjjAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"625ca2bfb4df6631355efb4c71c30467c055ab5ce40808ddd92b759142107747","last_reissued_at":"2026-05-18T00:09:20.212341Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:09:20.212341Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A QCD sum rules calculation of the $\\eta_c D^* D$ and $\\eta_c D_s^* D_s$ form factors and strong coupling constants","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"B. Os\\'orio Rodrigues, C. M. Zanetti, M. E. Bracco","submitted_at":"2017-07-07T18:45:54Z","abstract_excerpt":"We use the QCD sum rules for the three point correlation functions to compute the strong coupling constants of the meson vertices $\\eta_c D^* D$ and $\\eta_c D_s^* D_s$. We consider perturbative and non-perturbative contributions, working up to dimension five on the OPE. The vertices were studied considering that each one of its three mesons are off-shell alternately. The vertex coupling constant is evaluated through the extrapolation of the three different form factors. 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