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

Abstract

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 $N_f=3$ 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 $Q^2$ and the 3-flavor scheme prescription of Buza-Matiounine-Smith-van Neerven (BMSN) at the value of $Q^2=m_c^2$. 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 $\approx 1.5$. We obtain at NNLO ${\alpha }_s(M_Z^2)=0.1135\pm 0.0014$ in the fixed-flavor scheme and ${\alpha }_s(M_Z^2)=0.1129\pm 0.0applyingtheBMSN-prescription.Theimplicationsforimportantstandardcandleandhardscatteringprocessesathadroncollidersareillustrated.Predictionsforcrosssectionsof$W^{\pm}$-and$Z$-boson,thetop-quarkpair-andHiggs-bosonproductionattheTevatronandtheLHCbasedonthe5-flavorPDFsofthepresentanalysisareprovided.014$

33 pages, 14 figures, Journal version

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