# The pressure in 2, 2+1 and 3 flavour QCD

Karsch F, Laermann E, Peikert A (2000) *PHYSICS LETTERS B* 478(4): 447-455.

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We calculate the pressure in QCD with two and three light quarks on a lattice of size 16(3) X 4 using tree level improved gauge and fermion actions. We argue that, for temperatures T greater than or similar to 2T(c), systematic effects due to the finite lattice cut-off and non-vanishing quark masses are below 15% in this calculation and give an estimate for the continuum-extrapolated pressure in QCD with massless quarks. We find that the flavour dependence of the pressure is dominated by that of the Stefan-Boltzmann constant. Furthermore we perform a calculation of the pressure using two light (m(u,d)/T = 0.4) and one heavier quark (m(s)/T = 1). In this case the pressure is reduced with respect to that of 3-flavour QCD. This effect is stronger than expected from the mass dependence of an ideal Fermi gas. (C) 2000 Elsevier Science B.V. All rights reserved.

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Karsch F, Laermann E, Peikert A. The pressure in 2, 2+1 and 3 flavour QCD.

*PHYSICS LETTERS B*. 2000;478(4):447-455.Karsch, F., Laermann, E., & Peikert, A. (2000). The pressure in 2, 2+1 and 3 flavour QCD.

*PHYSICS LETTERS B*,*478*(4), 447-455. doi:10.1016/S0370-2693(00)00292-6Karsch, F., Laermann, E., and Peikert, A. (2000). The pressure in 2, 2+1 and 3 flavour QCD.

*PHYSICS LETTERS B*478, 447-455.Karsch, F., Laermann, E., & Peikert, A., 2000. The pressure in 2, 2+1 and 3 flavour QCD.

*PHYSICS LETTERS B*, 478(4), p 447-455. F. Karsch, E. Laermann, and A. Peikert, “The pressure in 2, 2+1 and 3 flavour QCD”,

*PHYSICS LETTERS B*, vol. 478, 2000, pp. 447-455. Karsch, F., Laermann, E., Peikert, A.: The pressure in 2, 2+1 and 3 flavour QCD. PHYSICS LETTERS B. 478, 447-455 (2000).

Karsch, Frithjof, Laermann, Edwin, and Peikert, A. “The pressure in 2, 2+1 and 3 flavour QCD”.

*PHYSICS LETTERS B*478.4 (2000): 447-455.
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arXiv hep-lat/0002003

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