MSbar PDFs are non-negative above an estimated perturbative scale, with clarification of the argument's domain of validity.
Comment on Quarks and Gluons at Small $x$ and the Sdis Factorization Scheme
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abstract
I present some comments on the partonic interpretation of the HERA data on the proton structure function. The effects of the resummation of the leading and next-to-leading $\ln x$-contributions are discussed. A new factorization scheme, in which these resummation effects are absorbed into a steep redefinition of the gluon density, is introduced and its (possible) interpretation and phenomenological relevance are suggested.
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On the positivity of MSbar parton distributions
MSbar PDFs are non-negative above an estimated perturbative scale, with clarification of the argument's domain of validity.