Nuclear parton distribution functions and their uncertainties

Journal Article · Fri Oct 01 00:00:00 EDT 2004 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.70.044905· OSTI ID:20695679

Hirai, M ^[1]; Kumano, S; Nagai, T -H ^[2]

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1. Radiation Laboratory, RIKEN, Institute of Physical and Chemical Research, Wako, Saitama, 351-0198 (Japan)
2. Department of Physics, Saga University, Saga, 840-8502 (Japan)

We analyze experimental data of nuclear structure-function ratios F{sub 2}{sup A}/F{sub 2}{sup A{sup '}} 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{sub 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{approx}0.01 from the F{sub 2} data and at x{approx}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{sup 2}.

• OSTI ID: 20695679
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 70, Issue 4; Other Information: DOI: 10.1103/PhysRevC.70.044905; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COMPARATIVE EVALUATIONS
CROSS SECTIONS
DISTRIBUTION
DISTRIBUTION FUNCTIONS
DRELL MODEL
GLUONS
NUCLEAR STRUCTURE
NUCLEI
PARTON MODEL
PARTONS
QUARKS
STRUCTURE FUNCTIONS
VALENCE