Small- x parton content of the photon

Journal Article · Sun Nov 01 04:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.46.3778· OSTI ID:7157989

Forshaw, J R; Harriman, P N ^[1]

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1. Department of Theoretical Physics, The University, Manchester M13 9PL (United Kingdom)

The parton content of the photon is examined systematically. In the low-{ital Q}{sup 2} region ({ital Q}{sup 2}{lt}1 GeV{sup 2}) we assume the photon behaves largely according to the vector-meson-dominance (VMD) hypothesis, while for higher {ital Q}{sup 2} we supplement the VMD with a purely perturbative pointlike component and QCD corrections. Special care is taken in the region of small {ital x}: we work in the leading-logarithm approximation (LLA) in 1/{ital x} at low {ital Q}{sup 2} and in the LLA in {ital Q}{sup 2} for {ital Q}{sup 2}{gt}4 GeV{sup 2}. We include small-{ital x} shadowing effects in the VMD sector and show that they need not be considered in the pointlike sector where the parton content is much less.

• OSTI ID: 7157989
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 46:9; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662230* -- Quantum Chromodynamics-- (1992-)
662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
COMPOSITE MODELS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
FUNCTIONS
GLUONS
INTERACTIONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTON MODEL
PERTURBATION THEORY
PHOTONS
POSTULATED PARTICLES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK-ANTIQUARK INTERACTIONS
QUARKS
STRUCTURE FUNCTIONS
VECTOR DOMINANCE MODEL