Nuclear PDFs Page: 3 of 6
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IL NUOVO CIMENTO
D. DE FLORIAN(1), R. SASSOT(1), M. STRATMANN(2) AND P. ZURITA(3)
(1) Departamento de Fisica and IFIBA, FCEyN, Universidad de Buenos Aires, Ciudad Uni-
versitaria, Pabellcn 1 (1428) Buenos Aires, Argentina
(2) Physics Department, Brookhaven National Laboratory, Upton, NY 11973, USA
(3) Departamento de Fisica de Particulas and IGFAE, Universidade de Santiago de Compostela,
15706 Santiago de Compostela, Galicia, Spain
Summary. We present the latest global QCD analysis of nuclear parton distri-
bution functions. The emerging picture is one of consistency, with universal nuclear
modification factors reproducing the main features of the data. Differences with
previous analyses are addressed.
PACS 12.38.-t, 24.85.+p, 13.15.+g, 13.60.-r
1. - Motivation
The last years have been witness to a significant progress in the extraction on nuclear
PDFs (nPDFs) from data. To the implementation of QCD corrections beyond the LO
 and uncertainty estimates [2, 3], new types of data are added, advancing towards fully
global analyses [3, 4, 5]. These hard probes have allowed for tighter constraints on each
partonic species and put to test the assumed universality of nuclear effects.
The founding stone of the nPDFs studies is the deep inelastic scattering (DIS) of
charged leptons off nuclear targets, which constrains the valence quark densities. A better
discrimination between valence and sea (anti-)quarks can be achieved by considering data
from Drell Yan (DY) and neutrino induced DIS off nuclear targets . Examined in ,
the result that the correction factors for neutrino DIS have a different behaviour from
the one seen with charged lepton probes , has caused some controversy. A check was
done in  using the nPDFs of  and no disagreement was found.
However, DIS and DY data are not enough to determine the gluon density. Thus,
we need to include data from gluon sensitive processes, such as the BNL-RHIC inclusive
pion production in deuteron-gold (dAu) collisions. This was done in , where the gluon
modification (w.r.t. the free proton) was found to be more pronounced than in [1, 2].
The extraction of nPDFs presented here  is a fully global QCD analysis. This results
in a set of nPDFs at next-to-leading order accuracy that supersedes the previous work
in . We adopt as reference a contemporary set of free proton PDFs . In accordance
VoL. ?, N. ?
@ Society Italians di Fisica
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D., De Florian; M., Stratmann; Zurita, P. & Sassot, R. Nuclear PDFs, article, October 22, 2012; United States. (digital.library.unt.edu/ark:/67531/metadc844710/m1/3/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.