{
  "id": "1110.1127",
  "version": "v2",
  "published": "2011-10-06T01:19:17.000Z",
  "updated": "2011-11-18T23:44:14.000Z",
  "title": "A new determination of α_s from hadronic τ decays",
  "authors": [
    "Diogo Boito",
    "Oscar Cata",
    "Maarten Golterman",
    "Matthias Jamin",
    "Kim Maltman",
    "James Osborne",
    "Santiago Peris"
  ],
  "comment": "31 pages, 7 figures, revtex, version accepted for publication, minor changes, reference added",
  "doi": "10.1103/PhysRevD.84.113006",
  "categories": [
    "hep-ph",
    "hep-ex",
    "hep-lat",
    "nucl-th"
  ],
  "abstract": "We present a new framework for the extraction of the strong coupling from hadronic \\tau decays through finite-energy sum rules. Our focus is on the small, but still significant non-perturbative effects that, in principle, affect both the central value and the systematic error. We employ a quantitative model in order to accommodate violations of quark-hadron duality, and enforce a consistent treatment of the higher-dimensional contributions of the Operator Product Expansion to our sum rules. Using 1998 OPAL data for the non-strange isovector vector and axial-vector spectral functions, we find the n_f=3 values \\alpha_s(m_\\tau^2)=0.307+-0.019 in fixed-order perturbation theory, and 0.322+-0.026 in contour-improved perturbation theory. For comparison, the original OPAL analysis of the same data led to the values 0.324+-0.014 (fixed-order) and 0.348+-0.021 (contour-improved).",
  "revisions": [
    {
      "version": "v2",
      "updated": "2011-11-18T23:44:14.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "13.35.Dx"
    ],
    "keywords": [
      "determination",
      "operator product expansion",
      "finite-energy sum rules",
      "non-strange isovector vector",
      "axial-vector spectral functions"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review D",
      "year": 2011,
      "month": "Dec",
      "volume": 84,
      "number": 11,
      "pages": 113006
    },
    "note": {
      "typesetting": "RevTeX",
      "pages": 31,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 930847,
      "adsabs": "2011PhRvD..84k3006B"
    }
  }
}