QCD Thermodynamics at Intermediate Coupling

The weak-coupling expansion of the QCD free energy is known to order g_s^6log{g_s}, however, the resulting series is poorly convergent at phenomenologically relevant temperatures. In this proceedings, I discuss hard-thermal-loop perturbation theory (HTLpt) which is a gauge-invariant reorganization of the perturbative expansion for gauge theories. I review a recent NNLO HTLpt calculation of QCD thermodynamic functions. I show that the NNLO HTLpt results are consistent with lattice data down to temperatures T~2T_c.

Note:

3 pages, 2 figures/ talk given at the conference 'Quark Confinement and the Hadron Spectrum IX', August 30 - September 3, 2010, Madrid, Spain/ to appear in the AIP proceedings

05.70.Ce
12.38.Bx
11.15.Me
11.10.Gh
free energy
perturbation theory
renormalization
gauge field theory
quantum chromodynamics
thermodynamics

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