Quark number susceptibilities of hot QCD up to g^6ln(g)

Details Quark number susceptibilities of hot QCD up to g^6ln(g) Quark number susceptibilities of hot QCD up to g^6ln(g)

2002-12-19

arxiv.org/abs/hep-ph/0212283v2

Phys.Rev. D67 (2003) 074032

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 3 figures Typos corrected, references added, figures modified

Scientific paper

10.1103/PhysRevD.67.074032

The pressure of hot QCD has recently been determined to the last perturbatively computable order g^6 ln(g) by Kajantie et al. using three-dimensional effective theories. A similar method is applied here to the pressure in the presence of small but non-vanishing quark chemical potentials, and the result is used to derive the quark number susceptibilities in the limit mu = 0. The diagonal quark number susceptibility of QCD with n_f flavours of massless quarks is evaluated to order g^6ln(g) and compared with recent lattice simulations. It is observed that the results qualitatively resemble the lattice ones, and that when combined with the fully perturbative but yet undetermined g^6 term they may well explain the behaviour of the lattice data for a wide range of temperatures.

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