Update of Parton Distributions at NNLO

Abstract

We present a new set of parton distributions obtained at NNLO. These differ from the previous sets available at NNLO due to improvements in the theoretical treatment. In particular we include a full treatment of heavy flavours in the region near the quark mass. In this way, an essentially complete set of NNLO partons is presented for the first time. The improved treatment leads to a significant change in the gluon and heavy quark distributions, and a larger value of the QCD coupling at NNLO, alpha_S(M_Z^2) = 0.1191 +/- 0.002(expt.) +/- 0.003(theory). Indirectly this also leads to a change in the light partons at small x and modifications of our predictions for W and Z production at the LHC. As well as the best-fit set of partons, we also provide 30 additional sets representing the uncertainties of the partons obtained using the Hessian approach.

13 pages, 11 figures. Version published. Slight extension and some modification of references

Cited by in corpus (28)

• Implications of CTEQ global analysis for collider observables
• Theoretical status and prospects for top-quark pair production at hadron colliders
• The theoretical top quark cross section at the Tevatron and the LHC
• Impact parameter dependent colour glass condensate dipole model
• Single top quark production at LHC with anomalous Wtb couplings
• Precision determination of electroweak parameters and the strange content of the proton from neutrino deep-inelastic scattering
• Heavy-quark pair production at two loops in QCD
• Using Dimensional Reduction for Hadronic Collisions
• Small x gluon from exclusive J/psi production
• Weak interaction corrections to hadronic top quark pair production: contributions from quark-gluon and $b\bar{b}$ induced reactions
• Higgs Hadroproduction at Large Feynman x
• Collinear and soft gluon corrections to Higgs production at NNNLO
• Early LHC measurements to check predictions for central exclusive production
• Status and Prospects of Top-Quark Physics
• Top quark physics at the LHC
• Nuclear effects in F_3 structure function of nucleon
• Two-Loop QCD Helicity Amplitudes for (2+1)-Jet Production in Deep Inelastic Scattering
• Higher-order corrections to top-antitop pair and single top quark production
• Remarkable virtual SUSY effects in $W^{\pm }$ production at high energy hadron colliders
• Genuine SUSY signatures from $ug\to \tilde d \tchi_i^+$ and $ug\to d{W}^{+}$, at high energies
• Photoproduction of single inclusive jets at future ep colliders in next-to-leading order QCD
• Parton Distributions: Progress and Challenges
• Hard QCD at hadron colliders
• Status of MRST/MSTW PDF sets
• Non-planar structure of analytical QCD predictions for the Gottfried sum rule
• LHC Probe of Quark Substructure at the Early Stages of Running
• Status of Deeply Inelastic Parton Distributions
• Structure Functions and Low-x