%0 Electronic Article
%A Lin, Huey-Wen
%A Nocera, Emanuele R.
%A Olness, Fred
%A Orginos, Kostas
%A Rojo, Juan
%A Accardi, Alberto
%A Alexandrou, Constantia
%A Bacchetta, Alessandro
%A Bozzi, Giuseppe
%A Chen, Jiunn-Wei
%A Collins, Sara
%A Cooper-Sarkar, Amanda
%A Constantinou, Martha
%A Del Debbio, Luigi
%A Engelhardt, Michael
%A Green, Jeremy
%A Gupta, Rajan
%A Harland-Lang, Lucian A.
%A Ishikawa, Tomomi
%A Kusina, Aleksander
%A Liu, Keh-Fei
%A Liuti, Simonetta
%A Monahan, Christopher
%A Nadolsky, Pavel
%A Qiu, Jian-Wei
%A Schienbein, Ingo
%A Schierholz, Gerrit
%A Thorne, Robert S.
%A Vogelsang, Werner
%A Wittig, Hartmut
%A Yuan, C.-P.
%A Zanotti, James
%T Parton distributions and lattice QCD calculations: a community white paper
%N DESY-17-185
%M PUBDB-2017-12339
%M DESY-17-185
%M IFJPAN-IV-2017-19
%M INT-PUB-17-042
%M MSUHEP-17-017
%M NIKHEF-2017-047
%M OUTP-17-15P
%M SMU-HEP-17-08
%M arXiv:1711.07916
%D 2017
%Z 80 pages, 15 figures, 28 tables
%X 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.
%F PUB:(DE-HGF)25 ; PUB:(DE-HGF)29
%9 PreprintReport
%R 10.3204/PUBDB-2017-12339
%U https://bib-pubdb1.desy.de/record/395855