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

Understand

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.