{
  "id": "1011.5612",
  "version": "v1",
  "published": "2010-11-25T12:34:00.000Z",
  "updated": "2010-11-25T12:34:00.000Z",
  "title": "Antiproton-to-Proton Ratios for ALICE Heavy-Ion Collisions",
  "authors": [
    "A. Tawfik"
  ],
  "comment": "5 pages, 1 eps figure, revtex4-style",
  "journal": "Nucl.Phys.A859:63-72,2011",
  "doi": "10.1016/j.nuclphysa.2011.04.014",
  "categories": [
    "hep-ph",
    "nucl-th"
  ],
  "abstract": "Assuming that the final state of hadronization takes place along the freezeout line, which is defined by a constant entropy density, the antiproton-to-proton ratios produced in heavy-ion collisions are studied in framework of the hadron resonance gas (HRG) model. A phase transition from quark--gluon plasma to hadrons, a hadronization, has been conjectured in order to allow modifications in the phase space volume and thus in single--particle distribution function. Implementing both modifications in the grand--canonical partition function and taking into account the experimental acceptance in heavy-ion collisions, the antiproton-to-proton ratios over center-of-mass energies $\\sqrt{s}$ ranging from AGS to RHIC are very well reproduced by the HRG model. Comparing with the same particle ratios in $pp$ collisions results in a gradually narrowing discrepancy with increasing $\\sqrt{s}$. At LHC energy, the ALICE antiproton-to-proton ratios in $pp$ collisions turn to be very well described by HRG model as well. It is likely that the ALICE heavy-ion program will produce the same antiproton-to-proton ratios as the $pp$ program. Furthermore, the ratio gets very close to unity indicating that the matter-antimatter asymmetry nearly vanishes. The chemical potential calculated at this energy strengthens the assumption of almost fully matter-antimatter symmetry at LHC energy.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-11-25T12:34:00.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "98.80.Cq",
      "05.40.-a",
      "25.75.Ld",
      "25.75.-q"
    ],
    "keywords": [
      "alice heavy-ion collisions",
      "lhc energy",
      "hrg model",
      "alice heavy-ion program",
      "constant entropy density"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "Elsevier",
      "journal": "Nuclear Physics A",
      "year": 2011,
      "month": "Jun",
      "volume": 859,
      "number": 1,
      "pages": 63
    },
    "note": {
      "typesetting": "RevTeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 879305,
      "adsabs": "2011NuPhA.859...63T"
    }
  }
}