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It is demonstrated that the presence of a phase transition in heavy ioncollisions, at beam energies that probe dense QCD matter, leads to asignificant enhancement of the dilepton yield per produced pion due to theextended emission time. In addition, the temperature of low mass dileptonsshows a modest decrease due to the mixed phase. The emission of dileptons inthe SIS18-SIS100 beam energies range is studied by augmenting the UrQMDtransport model with a realistic density dependent equation of state, as wellas two different phase transitions. This is achieved by extending the moleculardynamics interaction part of the UrQMD model to a density dependent interactionpotential with a high density minimum leading to a phase transition andmetastable coexisting high density states. Together with a high precisionmeasurement these simulations will be able to constrain the existence of aphase transition in QCD up to densities of several times nuclear saturationdensity.

Enhanced dilepton emission from a phase transition in dense matter