Nuclear modification factors of single hadrons and dihadrons at large transverse momentum (pT) 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 q characterizing the interaction between the parton jet and the produced medium. By confronting 6 current sets of NLO parton FFs for large pT hadron productions, we extract q quantitatively via a global fit to data for both single hadron and dihadron suppressions, and obtain q/T 3 = 4.74 − 6.72 at T = 370 MeV in central Au + Au collisions at √ sNN = 200 GeV, and q/T 3 = 3.07 − 3.98 at T = 480 MeV in central P b + P b collisions at √ sNN = 2.76 TeV. The numerical results show that the uncertainties for q extraction are brought by the different contributions of gluon-to-hadron in the 6 sets of FFs due to gluon energy loss being 9/4 times of quark energy loss.
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