Mate Csanad, Levente Krizsan
The time evolution of the medium created in heavy ion collisions can be described by hydrodynamical models. After expansion and cooling, the hadrons are created in a freeze-out. Their distribution describes the final state of this medium. To investigate the time evolution one needs to analyze penetrating probes, such as direct photon or dilepton observables. In this paper we analyze an 1+3 dimensional solution of relativistic hydrodynamics, and we calculate dilepton transverse momentum and invariant mass distributions. We investigate the dependence of dilepton production on time evolution parameters, such as emission duration and equation of state. Using earlier fits of this model to photon and hadron spectra, we compare our calculations to measurements as well.
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http://arxiv.org/abs/1305.6558
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