Impact-Parameter Dependent Nuclear Parton Distribution Functions: EPS09s and EKS98s and Their Applications in Nuclear Hard Processes - INSPIRE

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Impact-Parameter Dependent Nuclear Parton Distribution Functions: EPS09s and EKS98s and Their Applications in Nuclear Hard Processes

Ilkka Helenius
(
- Jyvaskyla U. and
- Helsinki Inst. of Phys.
)
,
Kari J. Eskola
(
- Jyvaskyla U. and
- Helsinki Inst. of Phys.
)
,
Heli Honkanen
(
- Jyvaskyla U. and
- Penn State U.
)
,
Carlos A. Salgado
(
)

May, 2012

36 pages

Published in:

JHEP 07 (2012) 073

e-Print:

1205.5359 [hep-ph]

DOI:

10.1007/JHEP07(2012)073

Report number:

CERN-PH-TH-2012-145

View in:

reference search183 citations

Citations per year

Abstract: (arXiv)

We determine the spatial (impact parameter) dependence of nuclear parton distribution functions (nPDFs) using the

A

-dependence of the spatially independent (averaged) global fits EPS09 and EKS98. We work under the assumption that the spatial dependence can be formulated as a power series of the nuclear thickness functions

T_A

. To reproduce the

A

-dependence over the entire

x

range we need terms up to

[T_A]^4

. As an outcome, we release two sets, EPS09s (LO, NLO, error sets) and EKS98s, of spatially dependent nPDFs for public use. We also discuss the implementation of these into the existing calculations. With our results, the centrality dependence of nuclear hard-process observables can be studied consistently with the globally fitted nPDFs for the first time. As an application, we first calculate the LO nuclear modification factor

R^{1jet}_{AA}

for primary partonic-jet production in different centrality classes in Au+Au collisions at RHIC and Pb+Pb collisions at LHC. Also the corresponding central-to-peripheral ratios

R_{CP}^{1jet}

are studied. We also calculate the LO and NLO nuclear modification factors for single inclusive neutral pion production,

R_{dAu}^{\pi^0}

, at mid- and forward rapidities in different centrality classes in d+Au collisions at RHIC. In particular, we show that our results are compatible with the PHENIX mid-rapidity data within the overall normalization uncertainties given by the experiment. Finally, we show our predictions for the corresponding modifications

R_{pPb}^{\pi^0}

in the forthcoming p+Pb collisions at LHC.

Note:

36 pages

Nuclear PDFs
hard processes
centrality dependence
nucleus+nucleus collisions
deuterium+nucleus collisions
proton+nucleus collisions
parton: distribution function
impact parameter: dependence
pi: production
heavy ion: scattering

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