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SUMMARY:Glueballs and statistical mechanics of the gluon plasma
DTSTART;VALUE=DATE-TIME:20090430T100000Z
DTEND;VALUE=DATE-TIME:20090430T110000Z
DTSTAMP;VALUE=DATE-TIME:20261109T132153Z
UID:indico-event-1691@indico.ific.uv.es
DESCRIPTION:Describing the gluon plasma as a gas of free transverse gluons
  with a temperature-dependent mass m(T) allows to reproduce its thermodyna
 mical features (energy\, pressure\, etc.)\, that have been computed in que
 nched lattice QCD [1\,2]. In standard statistical mechanics\, particle mas
 ses are constants: Introducing temperature-dependent masses thus demands a
  particular care since one has to build a new formalism which is still the
 rmodynamically consistent. We propose a general way to obtain such a forma
 lism from the first principles of statistical mechanics. A particular solu
 tion is to keep the standard form of the energy\, while the entropy of the
  system becomes nonextensive. This framework leads to an excellent agreeme
 nt with lattice QCD provided that m(T) has two basic features: linear asym
 ptotical increase and strong decrease near the critical temperature Tc [2]
 . We then argue that the peculiar behavior of m(T) is due to color interac
 tions between the gluons in the deconfined medium near Tc. Using an effect
 ive glueball model with a lattice QCD-derived screened color interaction\,
  we indeed show that the lightest glueballs remain bound in the gluon plas
 ma up to 1.6 Tc. Consequently\, the thermodynamical properties of the gluo
 n plasma can be understood by describing it as a mixture of free gluons an
 d glueballs\, the glueball abundance becoming negligible after 1.6 Tc [2].
  [1] A. Peshier B. Kämpfer\, O. P. Pavlenko\, and G. Soff\, Phys. Rev. D5
 4\, 2399 (1996) \; P. Lévai and U. Heinz\, Phys. Rev. C 57\, 1879 (1998).
  [2] G. Boyd et al\, Phys. Rev. Lett. 75\, 4169 (1995). [3] F. Brau and F.
  Buisseret\, arXiv :0902.4836.\n\nhttps://indico.ific.uv.es/event/1691/
LOCATION:Dpto. de Física Teórica (UVEG) Sala Seminarios
URL:https://indico.ific.uv.es/event/1691/
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