Positivity of NLO Spin-Dependent Parton Distributions

1998/03/04 by C. Bourrely, Bourrely, C., E. Leader +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph

paper · pdf · doi:10.48550/arxiv.hep-ph/9803238

6 pages, LateX, 1 figure

arxiv created 1998/03/04 · arxiv updated 2009/11/30

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 |ΔP_ij(z)| ≤ 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.

Related

• Positivity constraints in QCD
• Recent positivity constraints for spin observables and parton distributions
• Statistical parton distributions, TMD, positivity and all that
• Spin-dependent Parton Distributions
• Q²-evolution of spin-dependent parton densities