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    Parton distributions and lattice QCD calculations: A community white paper

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    Name:
    1711.07916v3.pdf
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    1.872Mb
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    Genre
    Pre-print
    Date
    2018-05-01
    Author
    Lin, HW
    Nocera, 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
    Show allShow less
    Subject
    Lattice QCD
    Global QCD fits
    Unpolarized/polarized parton distribution functions (PDFs)
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/4672
    
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    DOI
    10.1016/j.ppnp.2018.01.007
    Abstract
    © 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
    Elsevier BV
    Has part
    Progress in Particle and Nuclear Physics
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    For Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact scholarshare@temple.edu
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/4654
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