Abstract
Non-perturbative production of quark-antiquarks is investigated in the early stage of heavy-ion collisions. The time-dependent study is based on a kinetic description of the fermion-pair production in strong non-Abelian fields. We introduce time-dependent chromo-electric external field with a pulse-like time evolution in order to simulate the overlap of two colliding heavy ions. Our investigation is performed with finite current quark masses and focus on heavy quark-pair production. We have found that the small inverse duration time of the field pulse determines the efficiency of the quark-pair production. Therefore, the expected suppression for heavy quark production, as follows from the Schwinger formula for a constant field, is not seen, but an enhanced heavy quark production appears at ultrarelativistic energies.
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