The parton to hadron phase transition observed in Pb+Pb collisions at 158 GeV per nucleon

Details The parton to hadron phase transition observed in Pb+Pb collisions at 158 GeV per nucleon The parton to hadron phase transition observed in Pb+Pb collisions at 158 GeV per nucleon

1999-05-05

arxiv.org/abs/hep-ph/9905247v1

Phys.Lett. B456 (1999) 277-282

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 figures

Scientific paper

10.1016/S0370-2693(99)00482-7

Hadronic yields and yield ratios observed in Pb+Pb collisions at the SPS energy of 158 GeV per nucleon are known to resemble a thermal equilibrium population at T=180 +/- 10 MeV, also observed in elementary e+ + e- to hadron data at LEP. We argue that this is the universal consequence of the QCD parton to hadron phase transition populating the maximum entropy state. This state is shown to survive the hadronic rescattering and expansion phase, freezing in right after hadronization due to the very rapid longitudinal and transverse expansion that is inferred from Bose-Einstein pion correlation analysis of central Pb+Pb collisions.

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