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

Khaled Abdel-Waged; Nuha Felemban

doi:10.1088/1361-6471/aaa101

paper

Nucleon shadowing effects in $C u + C u$ and $A u + A u$ collisions at RHIC within the HIJING code

arXiv:1712.08298 · doi:10.1088/1361-6471/aaa101

Abstract

The centrality dependence of pseudorapidity density of charged particles ( $d N_{c h} / d η$ ) in $C u + C u$ ( $A u + A u$ ) collisions at RHIC energy of $s_{_{NN}} = 22.4$ , $62.4$ 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 ( $N N$ ) interactions and more modern parton distribution functions. The collective $N N$ -interactions are used to induce both cascade and nucleon shadowing effects. We find collective cascade broadens the pseudorapidity distributions in the tails (at $∣ η ∣ > y_{beam}$ ) above $25 - 30%$ collision centrality to be consistent with the $d N_{c h} / d η$ data at $s_{_{NN}} = 19.6$ , $22.4$ , $62.4$ GeV. The overall contribution of nucleon shadowing is shown to depress the whole shape of $d N_{c h} / d η$ in the primary interaction region (at $∣ η ∣ < y_{beam}$ ) for semiperipheral ( $20 - 25$ \%) and peripheral ( $\geq 35 - 40$ \%) $C u + C u$ ( $A u + A u$ ) interactions at $s_{_{NN}} = 200$ GeV, in accordance with the PHOBOS data.

18 pages, 10 figures

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

Abstract

References in corpus (8)

Nucleon shadowing effects in $C u + C u$ and $A u + A u$ collisions at RHIC within the HIJING code