Abstract
Final-state interaction and screening have a great influence on $$q\bar q$$ production cross sections, which are important quantities in many problems in quark-gluon plasma physics. They lead to an enhancement of the cross section for a $$q\bar q$$ color-singlet state and a suppression for a color-octet state. The effects are large near the production threshold. The presence of screening gives rise to resonances for $$q\bar q$$ production just above the threshold at specific plasma temperatures. These resonances, especially $$c\bar c$$ and $$b\bar b$$ resonances, may be utilized to search for the quark-gluon plasma by studying the temperature dependence of heavy-quark pair production just above the threshold.
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