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Thermodynamics at Non-Zero Baryon Number Density: A Comparison of Lattice and Hadron Resonance Gas Model Calculations

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arxiv hep-ph/0306208 v2 pith:K6BM3DY6 submitted 2003-06-23 hep-ph hep-latnucl-th

Thermodynamics at Non-Zero Baryon Number Density: A Comparison of Lattice and Hadron Resonance Gas Model Calculations

classification hep-ph hep-latnucl-th
keywords chemicalhadronlatticenon-zeropotentialquarkresonancethermodynamics
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We compare recent lattice studies of QCD thermodynamics at non-zero quark chemical potential with the thermodynamics of a hadron resonance gas. We argue that for T < Tc the equation of state derived from Monte--Carlo simulations of two flavour QCD at non-zero chemical potential can be well described by a hadron resonance gas when using the same set of approximations as used in current lattice calculations. We estimate the importance of truncation errors arising from the use of a Taylor expansion in terms of the quark chemical potential and examine the influence of unphysically large quark masses on the equation of state and the critical conditions for deconfinement.

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