Parton distributions and lattice QCD calculations: A community white paper
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Pre-printDate
2018-05-01Author
Lin, HWNocera, ER
Olness, F
Orginos, K
Rojo, J
Accardi, A
Alexandrou, C
Bacchetta, A
Bozzi, G
Chen, JW
Collins, S
Cooper-Sarkar, A
Constantinou, M
Del Debbio, L
Engelhardt, M
Green, J
Gupta, R
Harland-Lang, LA
Ishikawa, T
Kusina, A
Liu, KF
Liuti, S
Monahan, C
Nadolsky, P
Qiu, JW
Schienbein, I
Schierholz, G
Thorne, RS
Vogelsang, W
Wittig, H
Yuan, CP
Zanotti, J
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http://hdl.handle.net/20.500.12613/4672
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10.1016/j.ppnp.2018.01.007Abstract
© 2018 Elsevier B.V. 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.Citation to related work
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http://dx.doi.org/10.34944/dspace/4654