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Final-state interaction and screening have a great influence on $q \bar q$production cross sections, which are important quantities in many problems inquark-gluon plasma physics. They lead to an enhancement of the cross sectionfor 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 screeninggives rise to resonances for $q\bar q$ production just above the threshold atspecific plasma temperatures. These resonances, especially $c\bar c$ and $b\bar b$ resonances, may be utilized to search for the quark-gluon plasma bystudying the temperature dependence of heavy-quark pair production just abovethe threshold.

Effects of final-state interaction and screening on strange- and heavy-quark production