Heli Honkanen

Impact-parameter dependent nuclear parton distribution functions: EPS09s and EKS98s and their applications in nuclear hard processes

A bstractWe 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 TA. To reproduce the A-dependence over the entire x range we need terms up to [TA]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

CONSTRAINTS FOR NUCLEAR GLUON SHADOWING FROM DIS DATA

R_{{AA}}^{{1{text{jet}}}}

Electron g-2 in Light-Front Quantization

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

Applications of Basis Light-Front Quantization to QED

R_{{CP}}^{{1{text{jet}}}}

Nuclear Parton Distributions in the DGLAP Approach

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

Electron Anomalous Magnetic Moment in Basis Light-Front Quantization Approach

R_{text{dAu}}^{{{pi^0}}}

EPS09s and EKS98s: Impact parameter dependent nPDF sets

, 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

Extracting the impact parameter dependence of the nPDFs from the EKS98 and EPS09 global fits

R_{text{pPb}}^{{{pi^0}}}

DGLAP analyses of nPDF: constraints from data

in the forthcoming p+Pb collisions at LHC.

Basis light-front quantization: A new approach to non-perturbative scattering and time-dependent production processes

Abstract The Q 2 -dependence of the ratios of the cross sections of deep inelastic lepton–nucleus scattering is studied in the framework of leading twist, lowest order perturbative QCD. The log Q 2 slope of the ratio F 2 Sn / F 2 C is computed by using the DGLAP evolution equations, and shown to be sensitive to the nuclear gluon distribution functions. Four different parametrizations for the nuclear effects of parton distributions are studied. We show that the NMC data on the Q 2 -dependence of F 2 Sn / F 2 C rule out the case where nuclear shadowing (suppression) of gluons at x ∼0.01 is much larger than the shadowing observed in the ratio F 2 A / F 2 D . We also show that the possible non-linear correction terms due to gluon fusion in the evolution equations do not change this conclusion. Some consequences for computation of RHIC multiplicities, which probe the region x ≳0.01, are also discussed.