{"paper":{"title":"Fragmentation contributions to $J/\\psi$ photoproduction at HERA","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Geoffrey T. Bodwin, Hee Sok Chung (Argonne), Jungil Lee (Korea U.), U-Rae Kim","submitted_at":"2015-04-23T01:19:21Z","abstract_excerpt":"We compute leading-power fragmentation corrections to $J/\\psi$ photoproduction at DESY HERA, making use of the nonrelativistic QCD factorization approach. Our calculations include parton production cross sections through order $\\alpha_s^3$, fragmentation functions though order $\\alpha_s^2$, and leading logarithms of the transverse momentum divided by the charm-quark mass to all orders in $\\alpha_s$. We find that the leading-power fragmentation corrections, beyond those that are included through next-to-leading order in $\\alpha_s$, are small relative to the fixed-order contributions through nex"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.06019","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}