Parton distributions and lattice QCD calculations: a community white paper

By Huey-Wen Lin, E. Nocera, F. Olness, K. Orginos, Juan Rojo, A. Accardi, C. Alexandrou, A. Bacchetta, G. Bozzi, Jiunn-Wei Chen and 22 more. 2017

254 citations recorded by the source corpus.

In the framework of quantum chromodynamics (QCD), parton distribution functions (PDFs) quantify how the momentum and spin of a hadron are divided among its quark and gluon constituents. Two main approaches exist to determine PDFs. The first approach, based on QCD factorization theorems, realizes a QCD analysis of a suitable set of hard-scattering measurements, often using a variety of hadronic observables. The second approach, based on first-principle operator definitions of PDFs, uses lattice QCD to compute directly some PDF-related quantities, such as their moments. Motivated by recent progress in both approaches, in this document we present an overview of lattice-QCD and global-analysis techniques used to determine unpolarized and polarized proton PDFs and their moments. We provide benchmark numbers to validate present and future lattice-QCD calculations and we illustrate how they could be used to reduce the PDF uncertainties in current unpolarized and polarized global analyses. This document represents a first step towards establishing a common language between the two communities, to foster dialogue and to further improve our knowledge of PDFs.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/9a39e86a936b6d5c81a7412ffe5714782e5fc0a9

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In Nuclear and High Energy Physics

1. M. Constantinou
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Citations in the corpus

• A Guide to Light-Cone PDFs from Lattice QCD: An Overview of Approaches, Techniques, and Results (2018, background): “Note that these are beyond the scope of this review and we refer the interested Reader to the above references and a recent community white paper [27].”