Positivity of NLO Spin-Dependent Parton Distributions

Details Positivity of NLO Spin-Dependent Parton Distributions Positivity of NLO Spin-Dependent Parton Distributions

1998-03-04

arxiv.org/abs/hep-ph/9803238v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, LateX, 1 figure

Scientific paper

We discuss the positivity of the hadron density matrix in QCD. This basic property is shown to be preserved by QCD evolution, provided the relation $|\Delta P_{ij}(z)| \leq P_{ij}$ is valid for all kernels for $z < 1$, and the usual "+" prescription is used. We comment on the positivity restrictions for the choice of the NLO factorization scheme for the evolution of the spin-dependent parton distributions.

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