{"paper":{"title":"The OPE-Regge Transition in $J/\\psi$ Photoproduction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Minimal eikonal unitarization reconciles leading-twist J/ψ photoproduction with data from threshold to HERA energies.","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Arkadiy I. Syamtomov","submitted_at":"2026-04-22T06:50:04Z","abstract_excerpt":"We compare forward $J/\\psi$ photoproduction data from threshold to HERA with a threshold-normalized OPE direct-convolution calculation using modern NNLO gluon PDFs. The formal continuation of the threshold-normalized OPE baseline is used only as a diagnostic reference; its nearly PDF-independent mismatch with HERA data, of order $6$-$10$, quantifies the separation from the high-energy diffractive regime. We then describe the forward cross section by matching the OPE contribution to an effective Regge component at the cross-section level. The fit gives $W_m\\!=\\!7.4\\pm0.2$~GeV and an effective R"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"A minimal eikonal unitarization of the amplitude, with an energy-dependent saturation scale fitted to HERA data, reconciles the convolution with the full W-range measurements while leaving the threshold description unchanged. Near threshold the dispersive real part dominates the cross section, anchored by the OPE subtraction constant M_ψN(0)≃36-39 GeV^{-2}.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The assumption that the leading-twist OPE framework plus a minimal eikonal factor remains valid and unchanged near threshold, and that fitting the saturation scale to HERA data does not introduce uncontrolled systematics into the low-energy regime.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Leading-twist convolution with small-x singular PDFs matches threshold J/ψ data but requires eikonal unitarization fitted to HERA to cover the full energy range, with the dispersive real part dominating near threshold.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Minimal eikonal unitarization reconciles leading-twist J/ψ photoproduction with data from threshold to HERA energies.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"a409c05df091d9bbeea14e558b246933ee6cc8c034b9c64969dbff39a9e6342d"},"source":{"id":"2604.20247","kind":"arxiv","version":4},"verdict":{"id":"12a60ec2-fd78-413e-8e2d-a181e4f9cb5c","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-10T00:25:45.845384Z","strongest_claim":"A minimal eikonal unitarization of the amplitude, with an energy-dependent saturation scale fitted to HERA data, reconciles the convolution with the full W-range measurements while leaving the threshold description unchanged. Near threshold the dispersive real part dominates the cross section, anchored by the OPE subtraction constant M_ψN(0)≃36-39 GeV^{-2}.","one_line_summary":"Leading-twist convolution with small-x singular PDFs matches threshold J/ψ data but requires eikonal unitarization fitted to HERA to cover the full energy range, with the dispersive real part dominating near threshold.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The assumption that the leading-twist OPE framework plus a minimal eikonal factor remains valid and unchanged near threshold, and that fitting the saturation scale to HERA data does not introduce uncontrolled systematics into the low-energy regime.","pith_extraction_headline":"Minimal eikonal unitarization reconciles leading-twist J/ψ photoproduction with data from threshold to HERA energies."},"integrity":{"clean":false,"summary":{"advisory":1,"critical":4,"by_detector":{"doi_compliance":{"total":5,"advisory":1,"critical":4,"informational":0}},"informational":0},"endpoint":"/pith/2604.20247/integrity.json","findings":[{"note":"Identifier '10.1142/s0217751x95001361' is syntactically valid but the DOI registry (doi.org) returned 404, and Crossref / OpenAlex / internal corpus also have no record. 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