Parton Distributions: Summary Report

Abstract

We provide an assessment of the impact of parton distributions on the determination of LHC processes, and of the accuracy with which parton distributions (PDFs) can be extracted from data, in particular from current and forthcoming HERA experiments. We give an overview of reference LHC processes and their associated PDF uncertainties, and study in detail W and Z production at the LHC. We discuss the precision which may be obtained from the analysis of existing HERA data, tests of consistency of HERA data from different experiments, and the combination of these data. We determine further improvements on PDFs which may be obtained from future HERA data (including measurements of $F_L$), and from combining present and future HERA data with present and future hadron collider data. We review the current status of knowledge of higher (NNLO) QCD corrections to perturbative evolution and deep-inelastic scattering, and provide reference results for their impact on parton evolution, and we briefly examine non-perturbative models for parton distributions. We discuss the state-of-the art in global parton fits, we assess the impact on them of various kinds of data and of theoretical corrections, by providing benchmarks of Alekhin and MRST parton distributions and a CTEQ analysis of parton fit stability, and we briefly presents proposals for alternative approaches to parton fitting. We summarize the status of large and small x resummation, by providing estimates of the impact of large x resummation on parton fits, and a comparison of different approaches to small x resummation, for which we also discuss numerical techniques.

Report of Working Group I for the HERA-LHC Workshop

References in corpus (10)

• Higher-Order Soft Corrections to Lepton Pair and Higgs Boson Production
• Threshold resummation for electroweak annihilation from DIS data
• Parton distribution functions from the precise NNLO QCD fit
• Soft-gluon resummation effects on parton distributions
• Dimensional Regularisation and Factorisation Schemes in the BFKL Equation at Subleading Leve
• Scheme-invariant NNLO evolution for unpolarized DIS structure functions
• An Improved Splitting Function for Small x Evolution
• W/Z Production Cross Sections and Asymmetries at E_CM = 2 TeV
• Parton Distributions
• Searching for SUSY at the Tevatron

Cited by in corpus (28)

• Parton distributions for the LHC
• Heavy quarks in deep-inelastic scattering
• The 3-, 4-, and 5-flavor NNLO Parton from Deep-Inelastic-Scattering Data and at Hadron Colliders
• Higher-Order threshold effects to inclusive processes in QCD
• Structural Relations of Harmonic Sums and Mellin Transforms up to Weight w = 5
• Progress in the Determination of the Partonic Structure of the Proton
• Two-Loop Massive Operator Matrix Elements and Unpolarized Heavy Flavor Production at Asymptotic Values Q^2 >> m^2
• The Gluonic Operator Matrix Elements at O(α_s^2) for DIS Heavy Flavor Production
• Neural network determination of parton distributions: the nonsinglet case
• Two--Loop Massive Operator Matrix Elements for Unpolarized Heavy Flavor Production to $O(ε)
• The impact of PDF and alphas uncertainties on Higgs Production in gluon fusion at hadron colliders
• The Longitudinal Heavy Quark Structure Function F_{L}^{Q\bar{Q}} in the Region Q^2 \gg m^2 at O(α_s^3)
• QCD threshold corrections to di-lepton and Higgs rapidity distributions beyond N${}^2$LO
• Deviations from NLO QCD evolution in inclusive HERA data
• Higher Twist Contributions to the Structure Functions F_2^p(x,Q^2) and F_2^d(x,Q^2) at Large x and Higher Orders
• PQCD Formulations with Heavy Quark Masses and Global Analysis
• Structural Relations between Harmonic Sums up to w=6
• F2c at low x
• Can we trust small x resummation?
• Unparticles in diphoton production to NLO in QCD at the LHC
• The neural network approach to parton distribution functions
• Structure Function Resummation in small-x QCD
• Recent theoretical progress in perturbative QCD
• Progress on neural parton distributions
• Resummations in QCD hard-scattering at large and small x
• How Resummation Depresses the Gluon at Small x
• Status of Deeply Inelastic Parton Distributions
• Recent progress on NNPDF for LHC