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arXiv · 2112.14329

Large-x power laws of parton distributions remain inconclusive

Aurore Courtoy·Pavel M. Nadolsky
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Abstract

Focusing on hadron scattering at large partonic momentum fractions $x$, we compare nonperturbative QCD predictions for the asymptotic behavior of DIS structure functions and parton distribution functions (PDFs) to the $x$ and $Q$ dependence of phenomenological PDFs. In the CT18 NNLO global QCD analysis, higher-order radiative contributions and functional mimicry of PDF parametrizations result in about one unit of uncertainty in the effective powers of $(1-x)$ falloff of nucleon PDFs. Similar uncertainties are present in the case of the pion PDF, an object of growing interest in phenomenology.

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Aurore Courtoy, Pavel M. Nadolsky. 2021-12-28. Large-x power laws of parton distributions remain inconclusive. https://arxiv.org/abs/2112.14329

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