Momentum Sum Rules in QCD for a Photon Target

Details Momentum Sum Rules in QCD for a Photon Target Momentum Sum Rules in QCD for a Photon Target

1995-05-29

arxiv.org/abs/hep-ph/9505406v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revtex, uses epsfig.sty, 2 eps figures

Scientific paper

We deduce momentum sum rules for the parton structure functions of a photon target. Non-perturbative QCD contribution to the momentum sum rules follows from conservation of the energy--momentum tensor and it is calculated through the hadronic part of the photon vacuum polarization operator. The contribution of the unresolved photon unambiguously follows from gauge invariance, renormalizability and asymptotic freedom in QCD. We also compare available parametrizations of parton distribution in a photon with the deduced sum rules.

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