The ABM parton distributions tuned to LHC data

Abstract

We present a global fit of parton distributions at next-to-next-to-leading order (NNLO) in QCD. The fit is based on the world data for deep-inelastic scattering, fixed-target data for the Drell-Yan process and includes, for the first time, data from the Large Hadron Collider (LHC) for the Drell-Yan process and the hadro-production of top-quark pairs. The analysis applies the fixed-flavor number scheme for n_f=3,4,5, uses the MS-bar scheme for the strong coupling α_s and the heavy-quark masses and keeps full account of the correlations among all non-perturbative parameters. At NNLO this returns the values of α_s(M_Z) = 0.1132 +- 0.0011 and m_t(pole) = 171.2 +- 2.4 GeV for the top-quark pole mass.The fit results are used to compute benchmark cross sections for Higgs production at the LHC to NNLO accuracy. We compare our results to those obtained by other groups and show that differences can be linked to different theoretical descriptions of the underlying physical processes.

31 pages, 15 figures

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• Two-Loop Massive Operator Matrix Elements and Unpolarized Heavy Flavor Production at Asymptotic Values Q^2 >> m^2
• Combination of measurements of the top-quark pair production cross section from the Tevatron Collider
• Measurement of the cross-section for Z->e+e- production in pp collisions at sqrt{s}=7TeV
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• Evaluation of the Strong Coupling Constant alpha_s Using the ATLAS Inclusive Jet Cross-Section Data
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• PQCD Formulations with Heavy Quark Masses and Global Analysis
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• Phenomenology of threshold corrections for inclusive jet production at hadron colliders
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• Higher Twist contributions to the Structure Functions F_2(x,Q^2) and g_2(x,Q^2)
• Parton distributions and Tevatron jet data
• Running heavy-quark masses in DIS
• ABM news and benchmarks

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