On positivity of parton distributions

Details On positivity of parton distributions On positivity of parton distributions

1998-06-11

arxiv.org/abs/hep-ph/9806345v1

Nucl.Phys. B534 (1998) 277-296

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 8 figures included by epsf, plain tex with harvmac

Scientific paper

10.1016/S0550-3213(98)00661-0

We discuss the bounds on polarized parton distributions which follow from their definition in terms of cross section asymmetries. We spell out how the bounds obtained in the naive parton model can be derived within perturbative QCD at leading order when all quark and gluon distributions are defined in terms of suitable physical processes. We specify a convenient physical definition for the polarized and unpolarized gluon distributions in terms of Higgs production from gluon fusion. We show that these bounds are modified by subleading corrections, and we determine them up to NLO. We examine the ensuing phenomenological implications, in particular in view of the determination of the polarized gluon distribution.

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