Unraveling hadron structure with generalized parton distributions

Andrei Belitsky, A. V. Radyushkin

Research output: Contribution to journalArticle

532 Citations (Scopus)

Abstract

The generalized parton distributions, introduced nearly a decade ago, have emerged as a universal tool to describe hadrons in terms of quark and gluonic degrees of freedom. They combine the features of form factors, parton densities and distribution amplitudes-the functions used for a long time in studies of hadronic structure. Generalized parton distributions are analogous to the phase-space Wigner quasi-probability function of nonrelativistic quantum mechanics which encodes full information on a quantum-mechanical system. We give an extensive review of main achievements in the development of this formalism. We discuss physical interpretation and basic properties of generalized parton distributions, their modeling and QCD evolution in the leading and next-to-leading orders. We describe how these functions enter a wide class of exclusive reactions, such as electro- and photo-production of photons, lepton pairs, or mesons. The theory of these processes requires and implies full control over diverse corrections and thus we outline the progress in handling higher-order and higher-twist effects. We catalogue corresponding results and present diverse techniques for their derivations. Subsequently, we address observables that are sensitive to different characteristics of the nucleon structure in terms of generalized parton distributions. The ultimate goal of the GPD approach is to provide a three-dimensional spatial picture of the nucleon, direct measurement of the quark orbital angular momentum, and various inter- and multi-parton correlations.

Original languageEnglish (US)
Pages (from-to)1-387
Number of pages387
JournalPhysics Reports
Volume418
Issue number1-6
DOIs
StatePublished - Oct 2005

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partons
quarks
photoproduction
hadrons
catalogs
form factors
quantum mechanics
leptons
derivation
mesons
angular momentum
degrees of freedom
quantum chromodynamics
formalism
orbitals
photons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Unraveling hadron structure with generalized parton distributions. / Belitsky, Andrei; Radyushkin, A. V.

In: Physics Reports, Vol. 418, No. 1-6, 10.2005, p. 1-387.

Research output: Contribution to journalArticle

Belitsky, Andrei ; Radyushkin, A. V. / Unraveling hadron structure with generalized parton distributions. In: Physics Reports. 2005 ; Vol. 418, No. 1-6. pp. 1-387.
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