| dc.description.abstract | In the evolution of fireballs produced by Ulra-Relativistic High Energy Collisions, the introduction of a first-order phase transition between Quark Gluon Plasma (QGP) and hadronic matter phases was predicted to extend the fireball lifetime. In this paper, this prediction was tested through use of a thermal simulation of an isentropic fireball, at a collision energy of √s = 4.7GeV. It has been previously established that there is a strong correlation between fireball lifetimes and integrated dilepton yields, through use of an earlier version of this simulation. After updating the simulation to find the fireball acceleration based on its equation of state, an effective implementation of a first-order phase transition was obtained, and this implementation’s impact on integrated dilepton yields is then studied. It is confirmed that the correlation between integrated dilepton yield and lifetime was rather accurately conserved. After reintroducing the EoS-based acceleration, the transition’s effects on fireballs with collision energies other than 4.7GeV are also to be evaluated. Through combination of all of these results, the previously smooth trend between fireball lifetime and collision energy was seen to break at lower collision energies. As collision energy is decreased, at low energies, rather than continuing to decrease as is the case at high energies, the lifetime can be seen to increase again. This increase is explained as the effect of introducing a mixed-phase between QGP and hadronic matter, and is experimentally testable through finding the integrated dilepton yields. | |
