Nucleon shadowing effects in $Cu+Cu$ and $Au+Au$ collisions at RHIC within the HIJING code

Abstract

The centrality dependence of pseudorapidity density of charged particles ($d{N}_{ch}/d\eta$) in $Cu+Cu$ ($Au+Au$) collisions at RHIC energy of $\sqrt{s_{{}_{\mathrm{NN}}}}=22.4$ , $62.4$ and $200$ ($19.6$, $62.4$ and $200$) GeV, is investigated within an improved HIJING code. The standard HIJING model is enhanced by a prescription for collective nucleon-nucleon ($NN$) interactions and more modern parton distribution functions. The collective $NN$-interactions are used to induce both cascade and nucleon shadowing effects. We find collective cascade broadens the pseudorapidity distributions in the tails (at $|\eta |>y_{\mathrm{beam}}$) above $25-30\%$ collision centrality to be consistent with the $d{N}_{ch}/d\eta$ data at $\sqrt{s_{{}_{\mathrm{NN}}}}=19.6$, $22.4$, $62.4$ GeV. The overall contribution of nucleon shadowing is shown to depress the whole shape of $d{N}_{ch}/d\eta$ in the primary interaction region (at $|\eta |<y_{\mathrm{beam}}$) for semiperipheral ($20-25$ \%) and peripheral ($\ge 35-40$\%) $Cu+Cu$ ($Au+Au$) interactions at $\sqrt{s_{{}_{\mathrm{NN}}}}=200$ GeV, in accordance with the PHOBOS data.

arXiv comment18 pages, 10 figures

References in corpus (20)

• Parton distributions for the LHC
• Microscopic Models for Ultrarelativistic Heavy Ion Collisions
• A Multi-Phase Transport Model for Relativistic Heavy Ion Collisions
• Parton Ladder Splitting and the Rapidity Dependence of Transverse Momentum Spectra in Deuteron-Gold Collisions at RHIC
• Hadronic dissipative effects on elliptic flow in ultrarelativistic heavy-ion collisions
• Determination of nuclear parton distribution functions and their uncertainties at next-to-leading order
• Global Analysis of Nuclear Parton Distributions
• Phobos results on charged particle multiplicity and pseudorapidity distributions in Au+Au, Cu+Cu, d+Au, and p+p collisions at ultra-relativistic energies
• The eccentricity in heavy-ion collisions from Color Glass Condensate initial conditions
• Eccentricity fluctuations from the Color Glass Condensate at RHIC and LHC
• Gluon Shadowing and Hadron Production at RHIC
• Hadron production in p+p, p+Pb, and Pb+Pb collisions with the HIJING 2.0 model at energies available at the CERN Large Hadron Collider
• Geometric relation between centrality and the impact parameter in relativistic heavy-ion collisions
• Gluon shadowing and hadron production in heavy-ion collisions at LHC
• Charged particle (pseudo-)rapidity distributions in proton+anti-proton/proton+proton and Pb+Pb/Au+Au collisions from SPS to LHC energies from UrQMD
• Nuclear modification of high-p_T hadron spectra in p+A collisions at LHC
• Suppression of high transverse momenta hadrons in Pb+Pb collisions at LHC
• Enabling comparison of UrQMD with Geant4 hadronic models
• Kinematic constrains on interacting nucleons in $Pb+Pb$ collisions at $\sqrt{s_{NN}}=2.76$ TeV within the HIJING code
• Modelling the nuclear parton distributions