{
  "id": "hep-ph/9410237",
  "version": "v1",
  "published": "1994-10-06T18:43:00.000Z",
  "updated": "1994-10-06T18:43:00.000Z",
  "title": "Hadroproduction and Polarization of Charmonium",
  "authors": [
    "M. Vänttinen",
    "P. Hoyer",
    "S. J. Brodsky",
    "W. -K. Tang"
  ],
  "comment": "19 pages",
  "journal": "Phys.Rev.D51:3332-3339,1995",
  "doi": "10.1103/PhysRevD.51.3332",
  "categories": [
    "hep-ph"
  ],
  "abstract": "In the limit of heavy quark mass, the production cross section and polarization of quarkonia can be calculated in perturbative QCD. We study the $p_\\perp$-averaged production of charmonium states in $\\pi N$ collisions at fixed target energies. The data on the relative production rates of $\\jp$ and $\\chi_J$ is found to disagree with leading twist QCD. The polarization of the $\\jp$ indicates that the discrepancy is not due to poorly known parton distributions nor to the size of higher order effects ($K$-factors). Rather, the disagreement suggests important higher twist corrections, as has been surmised earlier from the nuclear target $A$-dependence of the production cross section.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1994-10-06T18:43:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "production cross section",
      "polarization",
      "important higher twist corrections",
      "hadroproduction",
      "heavy quark mass"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. D"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 19,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 377952
    }
  }
}