{"paper":{"title":"Intrinsic Charm Contribution to Double Quarkonium Hadroproduction","license":"","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"R. Vogt, S.J. Brodsky","submitted_at":"1995-03-02T02:02:05Z","abstract_excerpt":"Double $J/\\psi$ production has been observed by the NA3 collaboration in $\\pi N$ and $p N$ collisions with a cross section of the order of 20-30 pb. The $\\psi \\psi$ pairs measured in $\\pi^- $ nucleus interactions at 150 and 280 GeV$/c$ are observed to carry an anomalously large fraction of the projectile momentum in the laboratory frame, $x_{\\psi \\psi} \\geq 0.6$ at 150 GeV$/c$ and $\\geq 0.4$ at 280 GeV$/c$. We postulate that these forward $\\psi \\psi$ pairs are created by the materialization of Fock states in the projectile containing two pairs of intrinsic $c \\overline c$ quarks. We calculate "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9503206","kind":"arxiv","version":1},"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"}