Thermodynamics of lattice QCD with 3 flavours of colour-sextet quarks

Abstract

We have been studying QCD with 2 flavours of colour-sextet quarks to distinguish whether it is QCD-like or conformal. For comparison we are now studying QCD with 3 flavours of colour-sextet quarks, which is believed to be conformal in the chiral limit. Here we present the results of simulations of lattice QCD with 3 colour-sextet quarks at finite temperatures on lattices of temporal extent $N_t=4$ and 6, with masses small enough to yield access to the chiral limit. As for the 2-flavour case, we find well-separated deconfinement and chiral-symmetry restoration transitions, both of which move to appreciably weaker couplings as $N_t$ is increased from 4 to 6. If this theory is conformal, we would expect there to be a bulk chiral transition at a fixed coupling. For this reason we conclude that for $N_t=4$ and 6, the chiral and hence the deconfinement transitions are in the strong-coupling domain where the theory is essentially quenched. The similarity between the behaviours of the 2 and 3 flavour theories suggested that the $N_t=4$ and 6 transitions for the 2-flavour theory also lie in the strong-coupling domain. The phase structure of both theories is very similar.

17 pages Latex(Revtex), 7 postscript figures

References in corpus (6)

• Zero of the discrete beta function in SU(3) lattice gauge theory with color sextet fermions
• Phase structure of SU(3) gauge theory with two flavors of symmetric-representation fermions
• Running coupling and mass anomalous dimension of SU(3) gauge theory with two flavors of symmetric-representation fermions
• Accelerating Staggered Fermion Dynamics with the Rational Hybrid Monte Carlo (RHMC) Algorithm
• Parity Doubling and the S Parameter Below the Conformal Window
• Thermodynamics of lattice QCD with 2 sextet quarks on N_t=8 lattices

Cited by in corpus (10)

• On finite-temperature holographic QCD in the Veneziano limit
• Phase Transitions in Particle Physics -- Results and Perspectives from Lattice Quantum Chromo-Dynamics
• Strong dynamics, composite Higgs and the conformal window
• Near the sill of the conformal window: gauge theories with fermions in two-index representations
• A lattice QCD study of generalized gluelumps
• The renormalization group step scaling function of the 2-flavor SU(3) sextet model
• Finite Temperature Phase Diagrams of Gauge Theories
• Thermodynamics of lattice QCD with 3 flavours of colour-sextet quarks II: N_t=6 and N_t=8
• QCD with colour-sextet quarks
• Further studies of QCD with sextet quarks