Thermal e+e- Production in High-Energy Nuclear Collisions
We use a boost-invariant one-dimensional (cylindrically symmetric) fluid dynamics code to calculate e + e - production from the ρ-ω peak in the central rapidity region of S + Au and Pb + Pb collisions at SPS energy (√s = 20 GeV/nucleon). We assume that the hot matter is in thermal equilibrium throughout the expansion, but consider deviations from chemical equilibrium in the high temperature (deconfined) phase. We use equations of state with a first-order phase transition between a massless pion gas and quark gluon plasma, with transition temperatures in the range 150 ≤ T c ≤ 200 MeV.
KeywordsApparent Temperature Invariant Mass Spectrum Bulk Contribution Central Rapidity Region Transverse Expansion
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- 6.T. Ullrich, private communication.Google Scholar