On the critical line of 2+1 flavor QCD

Abstract

We determine the curvature of the (pseudo)critical line of QCD with $n_f$=2+1 staggered fermions at nonzero temperature and quark density, by analytic continuation from imaginary chemical potentials. Monte Carlo simulations are performed adopting the HISQ/tree action discretization, as implemented in the code by the MILC collaboration, suitably modified to include a nonzero imaginary baryon chemical potential. We work on a line of constant physics, as determined in Ref.\cite{Bazavov:2011nk}, adjusting the couplings so as to keep the strange quark mass $m_s$ fixed at its physical value, with a light to strange mass ratio $m_l/m_s=1/20$. In the present investigation we set the chemical potential at the same value for the three quark species, ${\mu }_l={\mu }_s\equiv \mu$. We explore lattices of different spatial extensions, $16^3\times 6$ and $24^3\times 6$, to check for finite size effects, and present results on a $32^3\times 8$ lattice, to check for finite cut-off effects. We discuss our results for the curvature $\kappa$ of the critical line at $\mu =0$, which indicate $\kappa =0.018(4)$, and compare them with previous lattice determinations by alternative methods and with experimental determinations of the freeze-out curve.

arXiv comment6 pages, 4 figures, 1 table

References in corpus (34)

• The chiral and deconfinement aspects of the QCD transition
• The QCD transition temperature: results with physical masses in the continuum limit
• Is there still any Tc mystery in lattice QCD? Results with physical masses in the continuum limit III
• The QCD phase diagram for small densities from imaginary chemical potential
• The QCD transition temperature: results with physical masses in the continuum limit II.
• Comparison of Chemical Freeze-Out Criteria in Heavy-Ion Collisions
• Finite density QCD via imaginary chemical potential
• Highly Improved Staggered Quarks on the Lattice, with Applications to Charm Physics
• Thermodynamics of Two Flavor QCD to Sixth Order in Quark Chemical Potential
• A new method to study lattice QCD at finite temperature and chemical potential
• The QCD Phase Diagram for Three Degenerate Flavors and Small Baryon Density
• The chiral critical line of N_f=2+1 QCD at zero and non-zero baryon density
• The phase boundary for the chiral transition in (2+1)-flavor QCD at small values of the chemical potential
• The QCD phase diagram at nonzero quark density
• Imaginary chemical potential and finite fermion density on the lattice
• Scaling studies of QCD with the dynamical HISQ action
• Hadron Formation in Relativistic Nuclear Collisions and the QCD Phase Diagram
• QCD thermodynamics from an imaginary mu_B: results on the four flavor lattice model
• The chiral critical point of Nf=3 QCD at finite density to the order (mu/T)^4
• Finite density QCD with a canonical approach
• Phase structure of lattice QCD with two flavors of Wilson quarks at finite temperature and chemical potential
• The critical line of two-flavor QCD at finite isospin or baryon densities from imaginary chemical potentials
• The factorization method for systems with a complex action -a test in Random Matrix Theory for finite density QCD-
• Analytic continuation of the critical line: suggestions for QCD
• The isentropic equation of state of 2-flavor QCD
• The Critical Points of Strongly Coupled Lattice QCD at Nonzero Chemical Potential
• Imaginary Chemical Potential Approach for the Pseudo-Critical Line in the QCD Phase Diagram with Clover-Improved Wilson Fermions
• How to get from imaginary to real chemical potential
• Responses of hadrons to chemical potential at finite temperature
• Phase diagram of QCD with four quark flavors at finite temperature and baryon density
• Real and imaginary chemical potential in 2-color QCD
• The phase diagram of QCD with four degenerate quarks
• Finite density (might well be easier) at finite temperature
• Finite temperature 2-color QCD for real and imaginary chemical potential

Cited by in corpus (48)

• The equation of state in (2+1)-flavor QCD
• Chiral crossover in QCD at zero and non-zero chemical potentials
• The QCD crossover at finite chemical potential from lattice simulations
• QCD at finite temperature and chemical potential from Dyson-Schwinger equations
• Phase structure of three and four flavor QCD
• Curvature of the chiral pseudo-critical line in QCD: continuum extrapolated results
• Finite-density lattice QCD and sign problem: current status and open problems
• Curvature of the pseudocritical line in QCD: Taylor expansion matches analytic continuation
• Higher order quark number fluctuations via imaginary chemical potentials in $N_f=2+1$ QCD
• Critical line of 2+1 flavor QCD: Toward the continuum limit
• QCD phase transitions via a refined truncation of Dyson-Schwinger equations
• Curvature of the chiral pseudo-critical line in QCD
• Roberge-Weiss endpoint at the physical point of $N_f=2+1$ QCD
• Interface Effect in QCD Phase Transitions via Dyson-Schwinger Equation Approach
• Radius of convergence in lattice QCD at finite ${\mu }_B$ with rooted staggered fermions
• Reliable estimation of the radius of convergence in finite density QCD
• A Rotation/Magnetism Analogy for the Quark-Gluon Plasma
• New approach to lattice QCD at finite density; results for the critical end point on coarse lattices
• Lattice simulations of the QCD chiral transition at real baryon density
• High-Temperature QCD: theory overview
• Anomaly matching in QCD thermal phase transition
• Thermodynamics of strong-interaction matter from Lattice QCD
• Roberge-Weiss endpoint and chiral symmetry restoration in $N_f=2+1$ QCD
• Finite-density QCD transition in magnetic field background
• Deconfinement transition line with the Complex Langevin equation up to $\mu /T\sim 5$
• Equation of state of a hot-and-dense quark gluon plasma: lattice simulations at real ${\mu }_B$ vs. extrapolations
• The effect of stout smearing on the phase diagram from multiparameter reweigthing in lattice QCD
• Fluctuating temperature and baryon chemical potential in heavy-ion collisions and the position of the critical end point in the effective QCD phase diagram
• Impact of the vector interaction on the phase structure of QCD matter
• Locating the critical end point of QCD
• On the critical end point in a two-flavor linear sigma model coupled to quarks
• Gauge-invariant screening masses and static quark free energies in $N_f=2+1$ QCD at non-zero baryon density
• Localization properties of Dirac modes at the Roberge-Weiss phase transition
• Dependence of the static quark free energy on ${\mu }_B$ and the crossover temperature of $N_f=2+1$ QCD
• Overview of the QCD phase diagram -- Recent progress from the lattice
• The Trajectory of the Cosmic Plasma Through the Quark Matter Phase Diagram
• The curvature of the chiral pseudocritical line from LQCD: analytic continuation and Taylor expansion compared
• Classification of sign-problem-free relativistic fermions on the basis of the Majorana positivity
• INFN What Next: Ultra-relativistic Heavy-Ion Collisions
• QCD phase diagram from the gluon propagator at finite temperature and density
• Exploring the hadron resonance gas phase on the QCD phase diagram
• Nature of the chiral phase transition of two flavour QCD from imaginary chemical potential with HISQ fermions
• Corrections to the hadron resonance gas from lattice QCD and their effect on fluctuation-ratios at finite density
• The curvature of the pseudo-critical line in the QCD phase diagram from mesonic lattice correlation functions
• Chiral Estimate of QCD Pseudocritical Line
• Resummed lattice QCD equation of state at finite baryon density: strangeness neutrality and beyond
• Hadronic matter at the edge: A survey of some theoretical approaches to the physics of the QCD phase diagram
• Curvature of the pseudocritical line in (2+1)-flavor QCD with HISQ fermions