Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-01-26
Prog.Part.Nucl.Phys. 42 (1999) 295-309
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, 13 figures
Scientific paper
10.1016/S0146-6410(99)00084-8
A selection of recent data referring to Pb+Pb collisions at the SPS CERN energy of 158 GeV per nucleon is presented which might describe the state of highly excited strongly interacting matter both above and below the deconfinement to hadronization (phase) transition predicted by lattice QCD. A tentative picture emerges in which a partonic state is indeed formed in central Pb+Pb collisions which hadronizes at about T = 185 MeV, and expands its volume more than tenfold, cooling to about 120 MeV before hadronic collisions cease. We suggest further that all SPS collisions, from central S+S onward, reach that partonic phase, the maximum energy density increasing with more massive collision systems.
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