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The Black Book of Quantum ChromodynamicsA Primer for the LHC Era$
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John Campbell, Joey Huston, and Frank Krauss

Print publication date: 2017

Print ISBN-13: 9780199652747

Published to Oxford Scholarship Online: March 2018

DOI: 10.1093/oso/9780199652747.001.0001

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Parton Distribution Functions

Parton Distribution Functions

6 Parton Distribution Functions
The Black Book of Quantum Chromodynamics

John Campbell

Joey Huston

Frank Krauss

Oxford University Press

Parton Distribution Functions (PDFs) are a necessary ingredient in the calculation of cross sections at collider experiments with hadron beams. This chapter explores the techniques of determining the PDFs and their uncertainties, based on global analyses of data sets arising from a variety of hard-scattering processes. PDFs are determined at leading order, next-to-leading order, and next-to-next-to-leading order, with the corresponding orders of hard coefficients and evolution. Differences in the PDFs of different orders, and in their uncertainties, are described. Combinations of PDFs from different global fitting groups are discussed, and several useful tools for comparisons of PDFs are described.

Keywords:   QCD, parton distribution functions, DGLAP, evolution, PDF uncertainties, parton luminosities, PDF4LHC, LHAPDF, CT14

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