2005/09/30 by Shinji Ejiri, S. Ejiri, C. R. Allton +9 · 1 citation
Physics and Astronomy · #Baryon #Chiral perturbation theory #Equation of state #Fermion #Flavour #Hadron #High-Energy Particle Collisions Research #Isospin #Lattice QCD #Mathematical physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Strange quark #Thermodynamics #hep-ph
paper · pdf · doi:10.1016/j.nuclphysa.2006.06.023
published as Nucl.Phys. A774 (2006) 837-840 · 4 pages, 7 figures, talk presented at Quark Matter 2005, Budapest
arxiv created 2005/09/30 · openalex publication_date 2006/08/01 · arxiv updated 2016/08/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present results of a simulation of 2 flavour QCD on a 163×4 lattice using p4-improved staggered fermions with bare quark mass m/T=0.4. Derivatives of the thermodynamic grand canonical partition function Z(V,T,μu,μd) with respect to chemical potentials μu,d for different quark flavours are calculated up to sixth order, enabling estimates of the pressure and the quark number density as well as the chiral condensate and various susceptibilities as functions of μu,d via Taylor series expansion. Results are compared to high temperature perturbation theory as well as a hadron resonance gas model. We also analyze baryon as well as isospin fluctuations and discuss the relation to the chiral critical point in the QCD phase diagram. We moreover discuss the dependence of the heavy quark free energy on the chemical potential.