Global reanalysis of nPDFs

Abstract

In this talk, we present the results from our recent global reanalysis of nuclear parton distribution functions (nPDFs), where the DGLAP-evolving nPDFs are constrained by nuclear hard process data from deep inelastic $l+A$ scattering (DIS) and the Drell-Yan (DY) process in $p+A$ collisions, and by sum rules. The main improvements over our earlier work {\em EKS98} are the automated ${\chi }^2$ minimization, better controllable fit functions and possibility for error estimates. The obtained 16-parameter fit to N=514 datapoints is good, ${\chi }^2/d.o.f=0.82$. Fit quality comparison and the error estimates obtained show that the old {\em EKS98} parametrization is fully consistent with the present automated reanalysis. Comparison with other global nPDF analyses is presented as well. Within the DGLAP framework we also discuss the possibility of incorporating a clearly stronger gluon shadowing, which is suggested by the RHIC BRAHMS data from d+Au collisions.

10 pages, talk given at the workshop "High-pT physics at LHC", March 23-27, 2007, Department of Physics, University of Jyvaskyla, Finland

References in corpus (7)

• Nuclear parton distributions at next to leading order
• A Re-Evaluation of the nuclear Structure Function Ratios for D, He, Li, C and Ca
• The Structure Function Ratios F2(Li)/F2(D) and F2(C)/F2(D) at small x
• Determination of nuclear parton distributions
• Nuclear parton distribution functions and their uncertainties
• Shadowing in Inelastic Scattering of Muons on Carbon, Calcium and Lead at Low XBj
• The scale dependent nuclear effects in parton distributions for practical applications

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