Abstract
In very energetic heavy ion collisions it is expected that chiral symmetry is temporarily restored. If the underlying QCD vacuum changes its structure rather suddenly, the transition is accompanied by a spontaneous and nonperturbative production of quark pairs. If gluons are already present they may assist additively to the overall production: As a particularly interesting nonequilibrium phenomena, real gluons are partially decaying during such a chiral transition. The total number of produced quarks is calculated and found to be quite sizeable. For the future collider experiments such effects could give rise to a significant contribution to the total number of quark pairs created in the preequilibrium stage of the reaction.
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The author thanks the Alexander von Humboldt Stiftung for its support with a Feodor Lynen Scholarship. This work was supported in part by the US Department of Energy (grant DE-FG05-90ER40592). The author is thankful for various stimulating discussions with Prof. B. Müller. Discussions with Prof. A. Schäfer and S. Mröwczynski are appreciated.