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Global Analysis of Nuclear PDFs
Daniel de Florian1, Rodolfo Sassot', Marco Stratmann2, Pia Zurita
'Departamento de Fisica and IFIBA, FCEyN, Universidad de Buenos Aires,
Ciudad Universitaria, Pabellon 1 (1428) Buenos Aires, Argentina
2Physics Department, Brookhaven National Laboratory, Upton, NY 11973, USA
DOI: will be assigned
We present a new global QCD analysis of nuclear parton distribution functions. In addition
to the most commonly analyzed data sets for deep inelastic scattering of charged leptons
off nuclei and Drell Yan di-lepton production, we include also measurements for neutrino-
nuclei scattering as well as inclusive pion production in deuteron-gold collisions. The
emerging picture is one of consistency, where universal nuclear modification factors for
each parton flavor reproduce the main features of all data without any significant tension
among the different sets.
In the last few years, significant progress has been made in obtaining nuclear PDFs (nPDFs)
from data. In addition to the theoretical improvements routinely used in modern extractions of
free proton PDFs, such as the consistent implementation of QCD corrections beyond the LO 
and uncertainty estimates [2, 3], the most recent determinations of nPDFs have also extended
the types of data sets taken into account, moving towards truly global QCD analyses of nuclear
effects [3, 4, 5, 6]. The addition of novel hard probes to the fit does not only lead to better
constrained sets of nPDFs and allows one to study the nuclear modification to the different
parton species individually, but also tests the assumed process independence of nuclear effects.
The deep inelastic scattering (DIS) of charged leptons off nuclear targets not only initiated
all studies of nPDFs but still provides the best constraints on nuclear modifications for quark
distributions. Upon combination with available data on Drell Yan (DY) di-lepton production
off nuclear targets, a better discrimination between valence and sea quarks can be achieved.
However, DIS and DY data only loosely constrain the nuclear modifications to the gluon density
because they cover a too small range in the hard energy scale Q. To remedy this situation,
data from BNL-RHIC for inclusive pion production in deuteron-gold (dAu) collisions have been
included in the analysis of nPDFs performed in Ref. . Not surprisingly, these data have a
significant impact in the determination of the gluon distribution. The corresponding nuclear
modification for gluons turned out to be much more pronounced than in previous estimates and
also much larger than those found for all the other partonic species.
Another promising avenue for significant improvements is neutrino induced DIS off iron and
lead targets, with results available from NuTeV, CDHSW, and CHORUS . These data receive
their importance from their discriminating power between nuclear modifications for quarks and
antiquarks and have been included in a series of analyses in Refs. [4, 6]. Unexpectedly, the
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D., de Florian; Sassot, R., Stratmann, M. & Zurita, P. Global Analysis of Nuclear PDFs, article, March 26, 2012; United States. (digital.library.unt.edu/ark:/67531/metadc844705/m1/3/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.