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- W2059783888 abstract "We calculate dilepton production rates from a fireball adapted to the kinematical conditions realized in ultrarelativistic heavy-ion collisions over a broad range of beam energies. The freeze-out state of the fireball is fixed by hadronic observables. We use this information combined with the initial geometry of the collision region to follow the space-time evolution of the fireball. Assuming entropy conservation, its bulk thermodynamic properties can then be uniquely obtained once the equation of state (EOS) is specified. The high-temperature quark-gluon plasma (QGP) phase is modeled by a nonperturbative quasiparticle model that incorporates a phenomenological confinement description, adapted to lattice QCD results. For the hadronic phase, we interpolate the EOS into the region where a resonance gas approach seems applicable, keeping track of a possible overpopulation of the pion phase space. In this way, the fireball evolution is specified without reference to dilepton data, thus eliminating it as an adjustable parameter in the rate calculations. Dilepton emission in the QGP phase is then calculated within the quasiparticle model. In the hadronic phase, both temperature and finite baryon density effects on the photon spectral function are incorporated. Existing dilepton data from CERES at 158 and $40 Amathrm{GeV}$ Pb-Au collisions are well described, and a prediction for the PHENIX setup at RHIC for $sqrt{s}=200Amathrm{GeV}$ is given." @default.
- W2059783888 created "2016-06-24" @default.
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- W2059783888 date "2002-07-03" @default.
- W2059783888 modified "2023-10-18" @default.
- W2059783888 title "Phases of QCD, thermal quasiparticles, and dilepton radiation from a fireball" @default.
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- W2059783888 doi "https://doi.org/10.1103/physrevc.66.014902" @default.
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