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From computations with Nf=2 dynamical quark in twisted mass QCD at four lattice spacings, we were able to take the continuum limit and obtained Gamma(J/psi -> eta_c gamma) = 2.64(11) keV and Gamma(hc -> eta_c gamma) = 0.72(5) MeV. We also computed the the hyperfine splitting and found that it does not depend from the sea quark mass and we obtain Delta = m_J/psi - m_eta_c = 112(4) MeV."},"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":"1301.5204","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2013-01-22T14:57:45Z","cross_cats_sorted":[],"title_canon_sha256":"988406bcf0b49d106796504b9477e756de49ac8dd0b8b635b848448cd0562c50","abstract_canon_sha256":"fd5d284a30a19472cb02f283597c7a8084b68211d641c40d3d3129b4032a90b7"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:35:52.667113Z","signature_b64":"z0q/tMrus44HA6Ta18Zay78BtNqCO3iMTvZR5ZXBa+7nKFdP+A85m0D5cs2pJc9w2TzDozM82EJF2v+QZylUDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"659eb6838c61ccafa124f1744ff76f435d172424deb405dbc645262f7e132814","last_reissued_at":"2026-05-18T03:35:52.666300Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:35:52.666300Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Radiative decays of charmonia on the lattice","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-lat","authors_text":"Damir Becirevic, Francesco Sanfilippo","submitted_at":"2013-01-22T14:57:45Z","abstract_excerpt":"We present the results of our lattice QCD study of the hadronic matrix elements relevant to the physical radiative J/psi -> eta_c gamma and hc -> eta_c gamma decays. 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