Positivity of NLO Spin-Dependent Parton Distributions
Abstract
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 | Pij(z)| ≤ Pij 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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