Date: Feb. 20, 2004
Speaker: R.P. Scharenberg, Purdue University (For FNAL-E-735)
Title: Signatures of the quark-gluon to hadron thermal phase transition
in pbar-p collisions at 1.8 TeV.
We have measured deconfined hadronic volumes, 4.4 < V < 13.0 fm (3),
produced by a one dimensional (1D) expansion. These volumes are
directly proportional to the charged particle pseudorapidity densities
6.75 < dNc/dn < 20.2. We have also measured the charged particle
multiplicity correlations. At hadronic freezeout after the
partonic expansion we observe an abrupt change in the hadronization
cluster size, indicating that the threshold for hadronic deconfinement
occurs for dNc/dn > 7. The hadronization temperature is
T = 179.5 ± 5 (syst) MeV. Using Bjorken's 1D model, the constant
(independent of the dNc/dn value) hadronization energy density is 1.1 ± O.26(stat) GeV/fm (3)
corresponding to an excitation of 24.8± 6.2
(stat) quark-gluon degrees of freedom.
T. Alexopoulos et al, Physics Letters B 528 (2002) 43-48
T. Alexopoulos et al, Physics Letters B 353 (1995) 155-160
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Marcela Carena and Bogdan Dobrescu.