Extracting the jet transport coefficient from jet quenching in high-energy heavy-ion collisions

Burke, K. M. and Buzzatti, A. and Chang, N. and Gale, C. h. and Gyulassy, Miklós Pál and Heinz, U. and Jeon, S. Y. and Majumder, A. and Müller, B. and Qin, G. -Y. and Schenke, B. and Shen, C. and Wang, X. -N. and Xu, J. C. and Young, C. and Zhang, H. H. (2014) Extracting the jet transport coefficient from jet quenching in high-energy heavy-ion collisions. PHYSICAL REVIEW C, 90 (1). ISSN 2469-9985

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Abstract

Within five different approaches to parton propagation and energy loss in dense matter, a phenomenological study of experimental data on suppression of large pT single inclusive hadrons in heavy-ion collisions at both RHIC and LHC was carried out. The evolution of bulk medium used in the study for parton propagation was given by 2+1D or 3+1D hydrodynamic models which are also constrained by experimental data on bulk hadron spectra. Values for the jet transport parameter ˆq at the center of the most central heavy-ion collisions are extracted or calculated within each model, with parameters for the medium properties that are constrained by experimental data on the hadron suppression factor RAA. For a quark with initial energy of 10 GeV we find that qˆ ≈ 1.2 ± 0.3 GeV2 /fm at an initial time τ0 = 0.6 fm/c in Au+Au collisions at √ s = 200 GeV/n and ˆq ≈ 1.9 ± 0.7 GeV2 /fm in Pb+Pb collisions at √ s = 2.76 TeV/n. Compared to earlier studies, these represent significant convergence on values of the extracted jet transport parameter, reflecting recent advances in theory and the availability of new experiment data from the LHC.

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