Nuclear parton distribution functions and their uncertainties

Apr, 2004
9 pages
Published in:
  • Phys.Rev.C 70 (2004) 044905
e-Print:
Report number:
  • SAGA-HE-197-04

Citations per year

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Abstract:
We analyze experimental data of nuclear structure-function ratios F_2^A/F_2^{A'} 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 F_2 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~0.01 from the F_2 data and at x~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 Q^2.
  • 13.60.Hb
  • 24.85.+p
  • 12.38.-t
  • 25.30.-c
  • lepton nucleus: deep inelastic scattering
  • nucleus: structure function
  • structure function: ratio
  • momentum spectrum: parton
  • parametrization
  • quark: charm