Extracting jet transport coefficient via single hadron and dihadron productions in high-energy heavy-ion collisions

Abstract

We study the suppressions of high transverse momentum single hadron and dihadron productions in high-energy heavy-ion collisions based on the framework of a next-to-leading-order perturbative QCD parton model combined with the higher-twist energy loss formalism.Our model can provide a consistant description for the nuclear modification factors of single hadron and dihadron productions in central and non-central nucleus-nucleus collisions at RHIC and the LHC energies. We quantitatively extract the value of jet quenching parameter $\hat q$ via a global $\chi^2$ analysis, and obtain ${\hat{q}}/{T^3} = 4.1 \sim 4.4$ at $T = 378$~MeV at RHIC and ${\hat{q}}/{T^3} = 2.6 \sim 3.3$ at $T = 486$~MeV at the LHC, which are consistent with the results from JET Collaboration. We also provide the predictions for the nuclear modification factors of dihadron productions in Pb+Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV and in Xe+Xe collisions at $\sqrt{s_{\rm{NN}}}$ = 5.44 TeV.