Positivity constraints in QCD

Details Positivity constraints in QCD Positivity constraints in QCD

1998-08-16

arxiv.org/abs/hep-ph/9808335v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 7 pages; Talk at XI International Conference (in memory of D.I. Blokhintsev) "Problems of Quantum Field Theory" (Dubna,

Scientific paper

The density matrix positivity is a natural counterpart of unitarity. The resulting constraints for various parton distribution and correlations are considered. Their compatibility with leading order QCD evolution is guaranteed by the probabilistic interpretation of the latter. In the case of non-forward distributions the positivity constraints naturally imply the symmetric form of the evolution equation.

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