QCD Thermodynamics with Three Flavors of Improved Staggered Quarks

Abstract

We report on a study of QCD thermodynamics with three flavors of quarks, using a Symanzik improved gauge action and the Asqtad O(a^2) improved staggered quark action. Simulations were carried out with lattice spacings 1/4T, 1/6T and 1/8T both for three degenerate quarks with masses less than or equal to the strange quark mass, m_s, and for degenerate up and down quarks with masses in the range 0.1 m_s \leq m_{u,d} \leq 0.6 m_s, and the strange quark mass fixed near its physical value. We present results for standard thermodynamics quantities, such as the Polyakov loop, the chiral order parameter and its susceptibility. For the quark masses studied to date we find a rapid crossover rather than a bona fide phase transition. We have carried out the first calculations of quark number susceptibilities with three flavors of sea quarks. These quantities are of physical interest because they are related to event-by-event fluctuations in heavy ion collision experiments. Comparison of susceptibilities at different lattice spacings show that our results are close to the continuum values.

33 pages, 18 figures, new data at a lighter quark mass, and revision of several figures

References in corpus (36)

• The QCD spectrum with three quark flavors
• Lattice Results on QCD Thermodynamics
• High-Precision Lattice QCD Confronts Experiment
• Light hadrons with improved staggered quarks: approaching the continuum limit
• Variants of fattening and flavor symmetry restoration
• Flavor-Symmetry Restoration and Symanzik Improvement for Staggered Quarks
• The pressure of QCD at finite temperatures and chemical potentials
• Testing improved actions for dynamical Kogut-Susskind quarks
• Quark number susceptibilities from HTL-resummed thermodynamics
• Where is the chiral critical point in 3-flavor QCD?
• Study of QCD thermodynamics at finite density by Taylor expansion
• Scaling tests of the improved Kogut-Susskind quark action
• Quark number susceptibilities of hot QCD up to g^6ln(g)
• QCD and the Chiral Critical Point
• The B_s and D_s decay constants in 3 flavor lattice QCD
• Susceptibilities and screening masses in two flavor QCD
• Thermodynamics of Four-Flavour QCD with Improved Staggered Fermions
• Quark number susceptibilities, strangeness and dynamical confinement
• Finite Temperature Transitions in Lattice QCD with Wilson Quarks --- Chiral Transitions and the Influence of the Strange Quark ---
• Quark Number Susceptibility in Hard Thermal Loop Approximation
• The continuum limit of quark number susceptibilities
• Quark Number Susceptibility, Thermodynamic Sum Rule, and Hard Thermal Loop Approximation
• Tests of Improved Kogut-Susskind Fermion Actions
• Comparing different hard-thermal-loop approaches to quark number susceptibilities
• Phase structure of lattice QCD at finite temperature for 2+1 flavors of Kogut-Susskind quarks
• Lattice Monte Carlo Data versus Perturbation Theory
• The three flavour chiral phase transition with an improved quark and gluon action in lattice QCD
• Event-by-event fluctuations and the QGP
• High temperature QCD with three flavors of improved staggered quarks
• Results on improved KS dynamical configurations: spectrum, decay constants, etc
• Statistical Fluctuations as Probes of Dense Matter
• The Phase Diagram of High Temperature QCD with Three Flavors of Improved Staggered Quarks
• Thermodynamics with 2+1 and 3 Flavors of Improved Staggered Quarks
• Quark number susceptibilities from lattice QCD
• Thermodynamics with 3 and 2+1 Flavors of Improved Staggered Quarks
• Lattice results with three quark flavours

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