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Saeed-uddin 《The European Physical Journal C - Particles and Fields》1999,6(2):355-363
The implications of the strangeness conservation in a hadronic resonance gas (HRG) on the expected phase transition to the
quark gluon plasma (QGP) are investigated. It is assumed that under favourable conditions a first order hadron-quark matter
phase transition may occur in the hot hadronic matter such as those produced in the ultra-relativistic heavy-ion collisions
at CERN and BNL. It is however shown that the criteria of strict strangeness conservation in the HRG may not permit the occurrence
of a strict first order equilibrium quark-hadron phase transition unlike a previous study. This emerges as a consequence of
the application of a realistic equation of state (EOS) for the HRG and QGP phases, which account for the finite-size effect
arising from the short range hard-core hadronic repulsion in the HRG phase and the perturbative QCD interactions in the QGP
phase. For a first order hadron-quark matter phase transition to occur one will therefore require large fluctuations in the
critical thermal parameters, which might arise due to superheating, supercooling or other nonequlibrium effects. We also discuss
a scenario proposed earlier, leading to a possible strangeness separation process during hadronization.
Received: 25 August 1997 / Revised version: 25 March 1998 / Published online: 26 August 1998 相似文献
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