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Physical Anomalous Dimensions at Small $x$
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abstract
I present a theoretical discussion of the uncertainties related to the QCD analysis of the proton structure function $F_2(x,Q^2)$ at small $x$. The role played by the `unphysical' gluon density is pointed out. It is shown how the study of more observables can reduce the theoretical uncertainty and, in particular, an alternative method of analysis, based on the introduction of physical anomalous dimensions, is suggested.
Forward citations
Cited by 3 Pith papers
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Next-to-leading order evolution of structure functions without PDFs
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PDF evolution in alternative factorisation schemes
Derives NLO splitting functions and anomalous dimensions for PDFs in alternative factorization schemes and interprets their leading x-behavior as a modified effective evolution scale.
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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.
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