{
  "id": "1308.0474",
  "version": "v2",
  "published": "2013-08-02T12:08:11.000Z",
  "updated": "2013-09-26T20:51:26.000Z",
  "title": "Production of J/psi+eta(c) vs. J/psi+J/psi at the LHC: Impact of Real alpha_s^5 corrections",
  "authors": [
    "Jean-Philippe Lansberg",
    "Hua-Sheng Shao"
  ],
  "comment": "5 pages, 11 figures, LaTeX. v2: matches the PRL version (3 typos corrected and title changed)",
  "journal": "Phys. Rev. Lett. 111 (2013) 122001",
  "doi": "10.1103/PhysRevLett.111.122001",
  "categories": [
    "hep-ph",
    "hep-ex"
  ],
  "abstract": "We proceed for the first time to the evaluation of the Born cross section for J/psi+eta(c) production, namely via g+g -> J/psi+eta(c)+g, and show that it has a harder P_T spectrum than the J/psi-pair yield at Born level. If one stuck to a comparison at Born level, one would conclude that J/psi+eta(c) production would surpass that of J/psi+J/psi at large P_T. This is nonetheless not the case since J/psi-pair production, as for single J/psi, receives leading-P_T contributions at higher orders in alpha_s. We also present the first evaluation of these leading-P_T next-to-leading order contributions. These are indeed significant for increasing P_T and are of essential relevance for comparison with forthcoming data. We also compute kinematic correlations relevant for double-parton-scattering studies. Finally, we evaluate the polarisation of a J/psi accompanied either by a eta(c) or a J/psi and another light parton. These results may be of great help to understand the polarisation of quarkonia produced at high energies.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2013-09-26T20:51:26.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "13.85.Ni",
      "12.38.Bx",
      "14.40.Pq"
    ],
    "keywords": [
      "production",
      "corrections",
      "born level",
      "born cross section",
      "kinematic correlations relevant"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2013,
      "month": "Sep",
      "volume": 111,
      "number": 12,
      "pages": 122001
    },
    "note": {
      "typesetting": "LaTeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1246144,
      "adsabs": "2013PhRvL.111l2001L"
    }
  }
}