The OPE-Regge Transition in $J/ψ$ Photoproduction
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866918534869680128 |
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| author | Syamtomov, Arkadiy I. |
| author_facet | Syamtomov, Arkadiy I. |
| contents | We compare forward $J/ψ$ 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 Regge exponent $δ_{\rm eff}\!=\!0.93\pm0.01$. Within this two-component description, $W_m$ estimates the phenomenological transition from the OPE-dominated threshold region to diffractive high-energy dynamics. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_20247 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The OPE-Regge Transition in $J/ψ$ Photoproduction Syamtomov, Arkadiy I. High Energy Physics - Phenomenology 81V05, 81U05, 78A60, 35Q40 We compare forward $J/ψ$ 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 Regge exponent $δ_{\rm eff}\!=\!0.93\pm0.01$. Within this two-component description, $W_m$ estimates the phenomenological transition from the OPE-dominated threshold region to diffractive high-energy dynamics. |
| title | The OPE-Regge Transition in $J/ψ$ Photoproduction |
| topic | High Energy Physics - Phenomenology 81V05, 81U05, 78A60, 35Q40 |
| url | https://arxiv.org/abs/2604.20247 |