Dilepton Spectra in Heavy Ion Collisions
The theoritical study1, 2 of the deconfined, dense hadronic matter produced in the relativistic collisions has shown that in the present day experiments a relatively high initial value for the light quark-gluon chemical equilibrium temperature is reached, namely T ch = 280 MeV in the S-W/Pb case at 200 GeV A. In the forthcoming Pb-Pb experiments at 160 GeV A we expect still a higher value: T ch = 324 MeV. At pre-chemical equilibrium even higher temperature values should be present — we recall that the production of the strange quark flavor acts to cool the system to the ‘observable’ chemical equilibrium temperature values which are about 50 MeV lower. We believe that these relatively high pre-strangeness temperatures can be observed studying the dilepton invariant mass spectra.
KeywordsInvariant Mass Hadronic Phase Hadron Contribution Transverse Expansion Dilepton Signal
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