{
  "id": "hep-ph/9707515",
  "version": "v1",
  "published": "1997-07-30T14:03:03.000Z",
  "updated": "1997-07-30T14:03:03.000Z",
  "title": "Nucleon matrix elements of higher-twist operators from the instanton vacuum",
  "authors": [
    "J. Balla",
    "M. V. Polyakov",
    "C. Weiss"
  ],
  "comment": "40 pages, LaTeX, 2 Figures included using epsf",
  "journal": "Nucl.Phys. B510 (1998) 327-364",
  "doi": "10.1016/S0550-3213(98)00638-5",
  "categories": [
    "hep-ph"
  ],
  "abstract": "We compute the nucleon matrix elements of QCD operators of twist 3 and 4 in the instanton vacuum. We consider the operators determining 1/Q^2-power corrections to the Bjorken, Ellis-Jaffe and Gross-Llewellyn-Smith sum rules. The nucleon is described as a soliton of the effective chiral theory derived from instantons in the 1/N_c-expansion. QCD operators involving the gluon field are systematically represented by effective operators in the effective chiral theory. We find that twist-3 matrix elements are suppressed relative to twist-4 by a power of the packing fraction of the instanton medium. Numerical results for the spin-dependent (d^(2), f^(2)) and spin-independent twist-3 and 4 matrix elements are compared with results of other approaches and with experimental estimates of power corrections. The methods developed can be used to evaluate a wide range of matrix elements relevant to DIS.",
  "revisions": [
    {
      "version": "v1",
      "updated": "1997-07-30T14:03:03.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "13.60.Hb",
      "12.38.Lg",
      "11.15.Kc",
      "12.39.Ki"
    ],
    "keywords": [
      "nucleon matrix elements",
      "instanton vacuum",
      "higher-twist operators",
      "effective chiral theory",
      "qcd operators"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "Elsevier",
      "journal": "Nucl. Phys. B"
    },
    "note": {
      "typesetting": "LaTeX",
      "pages": 40,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 446567
    }
  }
}