Nuclear parton distribution functions and their uncertainties

2004/04/30 by M. Hirai, S. Kumano, T. -H. Nagai +1 · 14 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.1103/physrevc.70.044905

published as Phys.Rev.C70:044905,2004 · 9 pages, REVTeX, 23 eps files, Phys. Rev. C in press. Nuclear PDF library is available at http://hs.phys.saga-u.ac.jp/nuclp.html

arxiv created 2004/07/15 · openalex publication_date 2004/10/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We analyze experimental data of nuclear structure-function ratios F₂^A∕F₂^A^\ensuremath' and Drell-Yan cross section ratios for obtaining optimum parton distribution functions (PDFs) in nuclei. Then, uncertainties of the nuclear PDFs are estimated by the Hessian method. Valence-quark distributions are determined by the F₂ data at large x; however, the small-x part is not obvious from the data. On the other hand, the antiquark distributions are determined well at x\ensuremath∼0.01 from the F₂ data and at x\ensuremath∼0.1 by the Drell-Yan data; however, the large-x behavior is not clear. Gluon distributions cannot be fixed by the present data and they have large uncertainties in the whole x region. Parametrization results are shown in comparison with the data. We provide a useful code for calculating nuclear PDFs at given x and Q².

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