{"paper":{"title":"Associated production of $\\chi_c$ pairs with a gluon in the collinear-factorization approach","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"Antoni Szczurek, Izabela Babiarz, Wolfgang Sch\\\"afer","submitted_at":"2019-02-22T10:31:17Z","abstract_excerpt":"We calculate cross section for production of $\\chi_c$ pairs in proton-proton collisions. The cross section for the $g g \\to \\chi_{c J_1} \\chi_{c J_2}$ is considerably smaller (especially for $\\chi_{c 1} \\chi_{c 1}$ final state) than that obtained recently in the $k_T$-factorization approach. We calculate therefore next-to-leading order contributions with $\\chi_c$ pair and one extra associated (mini-)jet. We find these contributions to be much larger than those for the $2 \\to 2$ contribution. Especially the emission of a leading gluon (carrying a large momentum fraction of one of the incoming g"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.08426","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"}