The 3, 4, and 5-flavor NNLO Parton from Deep-Inelastic-Scattering Data and at Hadron Colliders

Aug, 2009
34 pages
Published in:
  • Phys.Rev.D 81 (2010) 014032
e-Print:
Report number:
  • DESY-09-102,
  • SFB-CPP-09-072
Experiments:

Citations per year

20092013201720212025020406080
Abstract: (arXiv)
We determine the parton distribution functions (PDFs) in a next-to-next-to-leading order (NNLO) QCD-analysis of the inclusive neutral-current deep-inelastic-scattering (DIS) world data combined with the neutri{-}no-nucleon DIS di-muon data and the fixed-target Drell-Yan data. The PDF-evolution is performed in the Nf=3N_f = 3 fixed-flavor scheme and supplementary sets of PDFs in the 4- and 5-flavor schemes are derived from the results in the 3-flavor scheme using matching conditions. The charm-quark DIS contribution is calculated in a general-mass variable-flavor-number (GMVFN) scheme interpolating between the zero-mass 4-flavor scheme at asymptotically large values of momentum transfer Q2Q^2 and the 3-flavor scheme prescription of Buza-Matiounine-Smith-van Neerven (BMSN) at the value of Q2=mc2Q^2 = m_c^2. The results in the GMVFN scheme are compared with those of the fixed-flavor scheme and other prescriptions used in global fits of PDFs. The strong coupling constant is measured at an accuracy of 1.5\approx 1.5%. We obtain at NNLO αs(MZ2)=0.1135±0.0014\alpha_s(M_Z^2) = 0.1135 \pm 0.0014 in the fixed-flavor scheme and αs(MZ2)=0.1129±0.0applyingtheBMSNprescription.Theimplicationsforimportantstandardcandleandhardscatteringprocessesathadroncollidersareillustrated.Predictionsforcrosssectionsof\alpha_s(M_Z^2) = 0.1129 \pm 0.0applying the BMSN-prescription. The implications for important standard candle and hard scattering processes at hadron colliders are illustrated. Predictions for cross sections of W^{\pm}and- and Zboson,thetopquarkpairandHiggsbosonproductionattheTevatronandtheLHCbasedonthe5flavorPDFsofthepresentanalysisareprovided.014-boson, the top-quark pair- and Higgs-boson production at the Tevatron and the LHC based on the 5-flavor PDFs of the present analysis are provided.014
Note:
  • 33 pages, 14 figures, Journal version
  • 12.38.Bx
  • 11.10.Hi
  • 12.38.Qk
  • 14.65.Ha
  • parton: distribution function
  • Higgs particle: hadroproduction
  • strong interaction: coupling constant
  • neutrino nucleon: deep inelastic scattering
  • flavor: 3
  • flavor: 4