{
  "id": "0902.4000",
  "version": "v1",
  "published": "2009-02-23T21:03:55.000Z",
  "updated": "2009-02-23T21:03:55.000Z",
  "title": "Tomography of high-energy nuclear collisions with photon-hadron correlations",
  "authors": [
    "Hanzhong Zhang",
    "J. F. Owens",
    "Enke Wang",
    "Xin-Nian Wang"
  ],
  "comment": "4 pages in ReVTeX, 4 figures",
  "journal": "Phys.Rev.Lett.103:032302,2009",
  "doi": "10.1103/PhysRevLett.103.032302",
  "categories": [
    "nucl-th",
    "hep-ph",
    "nucl-ex"
  ],
  "abstract": "Within the next-to-leading order (NLO) perturbative QCD (pQCD) parton model, suppression of away-side hadron spectra associated with a high $p_{T}$ photon due to parton energy loss is studied in high-energy heavy-ion collisions. Dictated by the shape of the $\\gamma$-associated jet spectrum in NLO pQCD, hadron spectra at large $z_T=p_T^{h}/p_T^{\\gamma} \\stackrel{>}{\\sim} 1$ are more sensitive to parton energy loss and therefore are dominated by surface emission of $\\gamma$-associated jets, whereas small $z_{T}$ hadrons mainly come from fragmentation of jets with reduced energy which is controlled by the volume emission. These lead to different centrality dependence of the $\\gamma$-hadron suppression for different values of $z_{T}$. Therefore, a complete measurement of the suppression of $\\gamma$-triggered hadron spectra, including its dependence on the orientation of the $\\gamma$-hadron pair with respect to the reaction plane, allows the extraction of the spatial distribution of jet quenching parameters, achieving a true tomographic study of the quark-gluon plasma in high-energy heavy-ion collisions.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2009-02-23T21:03:55.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "24.85.+p",
      "25.75.-q",
      "12.38.Mh"
    ],
    "keywords": [
      "high-energy nuclear collisions",
      "photon-hadron correlations",
      "high-energy heavy-ion collisions",
      "parton energy loss",
      "tomography"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2009,
      "month": "Jul",
      "volume": 103,
      "number": 3,
      "pages": "032302"
    },
    "note": {
      "typesetting": "RevTeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 814020,
      "adsabs": "2009PhRvL.103c2302Z"
    }
  }
}