MSbar PDFs are non-negative above an estimated perturbative scale, with clarification of the argument's domain of validity.
Geometric Scaling from GLAP evolution
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abstract
We show that the geometric scaling of the total virtual photon-proton cross section data can be explained using standard linear GLAP perturbative evolution with generic boundary conditions in a wide kinematic region. This allows us to single out the region where geometric scaling may provide evidence for parton saturation.
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2023 1verdicts
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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.