Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-12-28
Phys.Usp. 47 (2004) 427-446; Usp.Fiz.Nauk 47 (2004) 427-446
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, 14 figures
Scientific paper
Major aspects of the subhadronic state of nuclear matter populated with deconfined color particles are reviewed. At high and even at rather low nuclear collision energies, this is expected to be a short-term quark-gluon plasma (QGP), but, seemingly, not only this. Emphasis is put on the self-consistency requirement that must be imposed on any phenomenological description of the evolution of a hot and dense nuclear medium as it expands (cools down) to the point where the final scattering of secondary particles starts. The view is argued and analyzed that massive constituent quarks should then play a major role at a certain cooling stage. A hypothesis is discussed regarding the existence of an intermediate stage (a valon plasma), allowing a consistent explanation of data on the mid-rapidity yields of various kinds of hadrons and direct dileptons (e+e- -pairs) in high-energy heavy-ion collisions.
Chernavskaya O. D.
Feinberg Evgenii L.
Royzen Ilya I.
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