3-, 4-, and 5-flavor next-to-next-to-leading order parton distribution functions from deep-inelastic-scattering data and at hadron colliders

2009/08/31 by S. Alekhin, J. Blümlein, S. Klein +1 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-lat #hep-ph

paper · pdf · doi:10.1103/physrevd.81.014032

published as Phys.Rev.D81:014032,2010 · 33 pages, 14 figures, Journal version

openalex publication_date 2010/01/29 · arxiv created 2010/05/17 · arxiv updated 2010/05/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We determine the parton distribution functions (PDFs) in a next-to-next-to-leading order QCD analysis of the inclusive neutral-current deep-inelastic-scattering (DIS) world data combined with the neutrino-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 Q² and the 3-flavor scheme prescription of Buza-Matiounine-Smith-van Neerven (BMSN) at the value of Q²=m_c². The results in the general-mass variable-flavor-number 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 \ensuremath≈1.5%. We obtain at next-to-next-to-leading order \ensuremathα_s(M_Z²)=0.1135\ifmmode±\else\textpm\fi0.0014 in the fixed-flavor scheme and \ensuremathα_s(M_Z²)=0.1129\ifmmode±\else\textpm\fi0.0014 applying the Buza-Matiounine-Smith-van Neerven prescription. The implications for important standard candle and hard scattering processes at hadron colliders are illustrated. Predictions for cross sections of W^\ifmmode±\else\textpm\fi- and Z-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.

Citations

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