Abstract
We have been studying QCD with two flavors of color-sextet quarks as a candidate walking-technicolor theory using lattice-QCD simulations. The evolution of the coupling constant with lattice spacing is measured at the finite-temperature chiral transition to determine if this theory is asymptotically free and hence QCD-like. The lattice spacing is varied by changing the number of lattice sites, , in the Euclidean time direction. QCD with three flavors is studied for comparison. Since this theory is expected to be conformal, with an infrared fixed point, the coupling constant at the chiral transition should approach a nonzero value as becomes large. Our earlier simulations on lattices with and exhibited a significant decrease in coupling at the chiral transition as was increased. We have now extended these simulations to , and performed additional simulations at to measure the coupling constant at the chiral transition more precisely. These indicate that while there is an appreciable decrease in coupling between and , this is much smaller than that between and . Thus we are hopeful that we are approaching the large- limit. However, further simulations at larger are needed.
- Received 13 June 2014
DOI:https://doi.org/10.1103/PhysRevD.90.014506
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