تقرير
Testing momentum dependence of the nonperturbative hadron structure in a global QCD analysis
| العنوان: | Testing momentum dependence of the nonperturbative hadron structure in a global QCD analysis |
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| المؤلفون: | Courtoy, A., Nadolsky, Pavel M. |
| المصدر: | Phys. Rev. D 103, 054029 (2021) |
| سنة النشر: | 2020 |
| المجموعة: | High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | High Energy Physics - Phenomenology |
| الوصف: | We discuss strategies for comparisons of nonperturbative QCD predictions for parton distribution functions (PDFs) with high-energy experiments in the region of large partonic momentum fractions $x$. Analytic functional forms for PDFs cannot be uniquely determined solely based on discrete experimental measurements because of a mathematical property of mimicry of PDF parametrizations that we prove using a representation based on B\'ezier curves. Predictions of nonperturbative QCD approaches for the $x$ dependence of PDFs instead should be cast in a form that enables decisive comparisons against experimental measurements. Predictions for effective power laws of $(1-x)$ dependence of PDFs may play this role. Expectations for PDFs in a proton based on quark counting rules are compared against the effective power laws of $(1-x)$ dependence satisfied by CT18 next-to-next-to-leading order parton distributions. We comment on implications for studies of PDFs in a pion, in particular on the comparison of nonperturbative approaches with phenomenological PDFs. Comment: 23 pages, 8 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevD.103.054029 |
| URL الوصول: | http://arxiv.org/abs/2011.10078 |
| رقم الأكسشن: | edsarx.2011.10078 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevD.103.054029 |
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