Excess Dileptons in High-Energy Nucleus-Nucleus Collisions
Abstract
It has been observed recently that while continuum dilepton production and open charm production in high-energy pA collisions can be described in terms of the superposition of pp collisions, dilepton yields in S+U collisions are in excess of similar extrapolations. This feature can be explained as arising from the interaction of gluons produced in different soft baryon-baryon collisions, leading to additional open-charm pairs in nucleus-nucleus collisions but not in pA collisions.
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