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

  • 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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Author:Reinhard StockGND
Document Type:Preprint
Year of Completion:1999
Year of first Publication:1999
Publishing Institution:Universit├Ątsbibliothek Johann Christian Senckenberg
Release Date:2005/09/14
Source:Phys.Lett. B456 (1999) 277-282,
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht