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Articles Particle Physics Positivity Constraints on Quark and Gluon Distributions in QCD (1978)
Positivity Constraints on Quark and Gluon Distributions in QCD (1978) |
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Arguments are given that quark and gluon momentum distributions generated by asymptotic freedom formulae from distributions which are positive at 
remain positive for 
. For 
they inevitably become negative. Momentum distributions at should be chosen so that this occurs only for very small 
. This constrains the partition of momentum between the quarks and gluons and the shapes of their momentum distributions.
