{
  "id": "0801.1235",
  "version": "v1",
  "published": "2008-01-08T14:05:55.000Z",
  "updated": "2008-01-08T14:05:55.000Z",
  "title": "Study of W boson polarisations and Triple Gauge boson Couplings in the reaction e+e- -> W+W- at LEP 2",
  "authors": [
    "The DELPHI Collaboration",
    "J. Abdallah"
  ],
  "comment": "34 pages, 17 figures, Accepted by Eur. Phys. J. C",
  "journal": "Eur.Phys.J.C54:345-364,2008",
  "doi": "10.1140/epjc/s10052-008-0528-3",
  "categories": [
    "hep-ex"
  ],
  "abstract": "A determination of the single W Spin Density Matrix (SDM) elements in the reaction e+e- -> W+W- -> l nu q qbar (l=e/mu) is reported at centre-of-mass energies between 189 and 209 GeV. The data sample used corresponds to an integrated luminosity of 520 pb^{-1} taken by DELPHI between 1998 and 2000. The single W SDM elements, rho_{tau tau'}^{W+-} (tau,tau' = +/-1 or 0), are determined as a function of the W- production angle with respect to the e- beam direction and are obtained from measurements of the W decay products by the application of suitable projection operators, Lambda_{tau tau'}, which assume the V-A coupling of the W boson to fermions. The measured SDM elements are used to obtain the fraction of longitudinally polarised Ws, with the result: sigma_L/sigma_tot = 24.9 +/- 4.5(stat) +/- 2.2(syst) % at a mean energy of 198 GeV. The SDM elements are also used to determine the Triple Gauge Couplings Delta g_1^Z, Delta kappa_gamma, lambda_gamma and g_4^Z, kappa_Z and lambda_Z. For the CP-violating couplings the results of single parameter fits are: g_4^Z = -0.39 +0.19 -0.20 kappa_Z = -0.09 +0.08 -0.05 lambda_Z = -0.08 +/- 0.07 . The errors are a combination of statistical and systematic errors. All results are consistent with the Standard Model.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2008-01-08T14:05:55.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "triple gauge boson couplings",
      "boson polarisations",
      "sdm elements",
      "triple gauge couplings delta",
      "single parameter fits"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "European Physical Journal C",
      "year": 2008,
      "month": "Apr",
      "volume": 54,
      "number": 3,
      "pages": 345
    },
    "note": {
      "typesetting": "TeX",
      "pages": 34,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 777039,
      "adsabs": "2008EPJC...54..345A"
    }
  }
}