Phase structure of thermal lattice QCD with N_f=2 twisted mass Wilson fermions

Abstract

We present numerical results for the phase diagram of lattice QCD at finite temperature in the formulation with twisted mass Wilson fermions and a tree-level Symanzik-improved gauge action. Our simulations are performed on lattices with temporal extent N_τ=8, and lattice coupling βranging from strong coupling to the scaling domain. Covering a wide range in the space spanned by the lattice coupling βand the hopping and twisted mass parameters κand μ, respectively, we obtain a comprehensive picture of the rich phase structure of the lattice theory. In particular, we verify the existence of an Aoki phase in the strong coupling region and the realisation of the Sharpe-Singleton scenario at intermediate couplings. In the weak coupling region we identify the phase boundary for the physical finite temperature phase transition/crossover. Its shape in the three-dimensional parameter space is consistent with Creutz's conjecture of a cone-shaped thermal transition surface.

24 pages, 16 figures

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Cited by in corpus (16)

• The QCD equation of state from the lattice
• On the order of the QCD chiral phase transition for different numbers of quark flavours
• The thermal QCD transition with two flavours of twisted mass fermions
• QCD thermodynamics with dynamical overlap fermions
• Landau gauge gluon and ghost propagators from lattice QCD with Nf=2 twisted mass fermions at finite temperature
• Lattice QCD based on OpenCL
• Deconfinement critical point of lattice QCD with $N_{\mathrm{f}}=2$ Wilson fermions
• Cutoff effects of Wilson fermions on the QCD equation of state to O(g^2)
• Kondo effect with Wilson fermions
• Towards the N_f=2 deconfinement transition temperature with O(a) improved Wilson fermions: An update
• Towards the N_f=2 deconfinement transition temperature with O(a) improved Wilson fermions
• QCD propagators and vertices from lattice QCD (in memory of Michael Müller-Preußker)
• Thermal transition temperature from twisted mass QCD
• LatticeQCD using OpenCL
• Exploration of the phase structure of $SU(N_c)$ lattice gauge theory with many Wilson fermions at strong coupling
• CL2QCD - Lattice QCD based on OpenCL