Uncertainties on α S in global PDF analyses and implications for predicted hadronic cross sections

2009/05/31 by A. D. Martin, W.J. Stirling, W. J. Stirling +2 · 486 citations
Mathematics · Physics and Astronomy · #Algorithm #Boson #Coupling (piping) #Deep inelastic scattering #Distribution (mathematics) #Factorization #Hadron #Higgs boson #High-Energy Particle Collisions Research #Inelastic scattering #Jet (fluid) #Large Hadron Collider #Mathematics #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Parton #Physics #Production (economics) #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Scattering #Tevatron #hep-ph

paper · pdf · doi:10.1140/epjc/s10052-009-1164-2

published in The European Physical Journal C 64(4), 653-680 (Springer Science+Business Media) · 45 pages, 17 figures. Grids can be found at http://projects.hepforge.org/mstwpdf/ and in LHAPDF V5.7.1. v2: version to appear in EPJC

arxiv created 2009/09/24 · openalex publication_date 2009/10/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/08

Abstract

We determine the uncertainty on the strong coupling alpha_S due to the experimental errors on the data fitted in global analysis of hard-scattering data, within the standard framework of leading-twist fixed-order collinear factorisation in the MSbar scheme, finding that alpha_S(M_Z²) = 0.1202^+0.0012_-0.0015 at next-to-leading order (NLO) and alpha_S(M_Z²) = 0.1171^+0.0014_-0.0014 at next-to-next-to-leading order (NNLO). We do not address in detail the issue of the additional theory uncertainty on alpha_S(M_Z²), but an estimate is +/-0.003 at NLO and at most +/-0.002 at NNLO. We investigate the interplay between uncertainties on alpha_S and uncertainties on parton distribution functions (PDFs). We show, for the first time, how both these sources of uncertainty can be accounted for simultaneously in calculations of cross sections, and we provide eigenvector PDF sets with different fixed alpha_S values to allow further studies by the general user. We illustrate the application of these PDF sets by calculating cross sections for W, Z, Higgs boson and inclusive jet production at the Tevatron and LHC.

Citations

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• Measurement of the Inclusive Jet Cross Section in pp Collisions at √s = 1.96 TeV
• Uncertainties of predictions from parton distribution functions. I. The Lagrange multiplier method
• High-Q2neutral current cross sections ine+pdeep inelastic scattering ats=318 GeV
• Measurement of the shape of the boson rapidity distribution forpp¯→Z/γ*→e+e−+Xevents produced atsof 1.96 TeV
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Precise measurement of dimuon production cross sections inνμFeandν¯μFedeep inelastic scattering at the Fermilab Tevatron

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