Extracting the jet transport coefficient from hadron suppressions by confronting current NLO parton fragmentation functions

) in high-energy heavy-ion collisions are studied in a next-to-leading-order (NLO) perturbative QCD parton model. Parton fragmentation functions (FFs) in

A+A

collisions are modified due to jet energy loss which is proportional to the jet transport coefficient

\hat{q}

characterizing the interaction between the parton jet and the produced medium. By confronting 6 current sets of NLO parton FFs for large

p_{\mathrm{T}}

hadron productions, we extract

\hat{q}

quantitatively via a global fit to data for both single hadron and dihadron suppressions and obtain

\hat{q}/T^3 = 4.74 - 6.72

at

T = 370

MeV in central

Au+Au

collisions at

\sqrt{s_{\mathrm{NN}}}=200

GeV, and

\hat{q}/T^3 = 3.07 - 3.98

at

T = 480

MeV in central

Pb+Pb

collisions at

\sqrt{s_{\mathrm{NN}}}=2.76

TeV. The numerical results show that the uncertainties for

\hat{q}

extraction are brought by the different contributions of gluon-to-hadron in the six sets of FFs due to gluon energy loss being 9/4 times of quark energy loss.

Note:

16 pages, 21 figures

parton: fragmentation function
gluon: energy loss
hadron: production
quantum chromodynamics: perturbation theory
jet: energy loss
heavy ion: scattering
model: parton
higher-order: 1
quark: energy loss
dihadron

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Figures(36)

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