{
  "id": "0807.2947",
  "version": "v1",
  "published": "2008-07-18T11:45:32.000Z",
  "updated": "2008-07-18T11:45:32.000Z",
  "title": "Strange mesons in nuclear matter at finite temperature",
  "authors": [
    "L. Tolos",
    "D. Cabrera",
    "A. Ramos"
  ],
  "comment": "35 pages, 10 figures, 1 table",
  "journal": "Phys.Rev.C78:045205,2008",
  "doi": "10.1103/PhysRevC.78.045205",
  "categories": [
    "nucl-th",
    "hep-ph"
  ],
  "abstract": "We study the properties of $K$ and $\\bar K$ mesons in nuclear matter at finite temperature from a chiral unitary approach in coupled channels which incorporates the $s$- and p-waves of the kaon-nucleon interaction. The in-medium solution accounts for Pauli blocking effects, mean-field binding on all the baryons involved, and $\\pi$ and kaon self-energies. We calculate $K$ and $\\bar K$ (off-shell) spectral functions and single particle properties. The $\\bar K$ effective mass gets lowered by about -50 MeV in cold nuclear matter at saturation density and by half this reduction at T=100 MeV. The p-wave contribution to the ${\\bar K}$ optical potential, due to $\\Lambda$, $\\Sigma$ and $\\Sigma^*$ excitations, becomes significant for momenta larger than 200 MeV/c and reduces the attraction felt by the $\\bar K$ in the nuclear medium.The $\\bar K$ spectral function spreads over a wide range of energies, reflecting the melting of the $\\Lambda (1405)$ resonance and the contribution of $YN^{-1}$ components at finite temperature. In the $KN$ sector, we find that the low-density theorem is a good approximation for the $K$ self-energy close to saturation density due to the absence of resonance-hole excitations. The $K$ potential shows a moderate repulsive behavior, whereas the quasi-particle peak is considerably broadened with increasing density and temperature. We discuss the implications for the decay of the $\\phi$ meson at SIS/GSI energies as well as in the future FAIR/GSI project.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2008-07-18T11:45:32.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "21.65.-f",
      "25.80.Nv",
      "13.75.Jz",
      "14.40.Aq"
    ],
    "keywords": [
      "finite temperature",
      "strange mesons",
      "saturation density",
      "spectral function spreads",
      "in-medium solution accounts"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review C",
      "year": 2008,
      "month": "Oct",
      "volume": 78,
      "number": 4,
      "pages": "045205"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 35,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 791053,
      "adsabs": "2008PhRvC..78d5205T"
    }
  }
}