Abstract
The pion production at mid-rapidity in gold–gold collisions at(s)1/2 = 200 GeV is investigated by the parton recombination model.The density of the hot medium produced in the collisions and the hardparton energy loss effect are obtained by fitting the experimental data.Both of them are found to have power-law dependence on the number ofbinary collisions. The implication of such dependence on the nuclearmodification factor is discussed.
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