{
  "id": "0810.3984",
  "version": "v2",
  "published": "2008-10-22T07:35:20.000Z",
  "updated": "2009-01-05T13:49:23.000Z",
  "title": "Scalar susceptibility from the instanton vacuum with meson-loop corrections",
  "authors": [
    "Seung-il Nam"
  ],
  "comment": "11 pages, 3 figures, accepted for publication in Phys.Rev.D",
  "journal": "Phys.Rev.D79:014008,2009",
  "doi": "10.1103/PhysRevD.79.014008",
  "categories": [
    "hep-ph"
  ],
  "abstract": "The scalar susceptibility (chi_s) of QCD, which represents the response of the chiral condensate to a small perturbation of explicit chiral-symmetry breaking, is investigated within the nonlocal chiral quark model (NLchiQM) based on the instanton vacuum configuration for N_f = 2. We also take into account 1/N_c meson-loop (ML) corrections including scalar and pseudoscalar mesons. It turns out that the chiral condensate is modified to a large extend by the ML corrections in the vicinity of m = 0, whereas its effect becomes weak beyond m ~ 100 MeV. As numerical results, we find that chi_s = -0.34 GeV^2 with the ML corrections and 0.18 GeV^2 without it, respectively. From these observations, we conclude that the ML corrections play an important role in the presence of finite current-quark mass.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2009-01-05T13:49:23.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "14.40.Aq",
      "12.38.Lg"
    ],
    "keywords": [
      "scalar susceptibility",
      "meson-loop corrections",
      "chiral condensate",
      "nonlocal chiral quark model",
      "finite current-quark mass"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review D",
      "year": 2009,
      "month": "Jan",
      "volume": 79,
      "number": 1,
      "pages": "014008"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 800304,
      "adsabs": "2009PhRvD..79a4008N"
    }
  }
}