Are Parton Distributions Positive?

Details Are Parton Distributions Positive? Are Parton Distributions Positive?

1998-08-28

arxiv.org/abs/hep-ph/9808462v1

Nucl.Phys.Proc.Suppl. 74 (1999) 138-141

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 4 figures, latex with espcrc2 and epsfig

Scientific paper

10.1016/S0920-5632(99)00150-4

We show that the naive positivity conditions on polarized parton distributions which follow from their probabilistic interpretation in the naive parton model are reproduced in perturbative QCD at the leading log level if the quark and gluon distribution are defined in terms of physical processes. We show how these conditions are modified at the next-to-leading level, and discuss their phenomenological implications, in particular in view of the determination of the polarized gluon distribution

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