We extend our previous study of the SU(3) gauge theory with Nf=2 flavors of fermions in the sextet representation of color. Our tool is the Schrödinger functional method. By changing the lattice action, we push the bulk transition of the lattice theory to stronger couplings and thus reveal the beta function and the mass anomalous dimension γm over a wider range of coupling, out to g2â‰11. Our results are consistent with an infrared fixed point, but walking is not ruled out. Our main result is that γm never exceeds 0.45, making the model unsuitable for walking technicolor. We use a novel method of extrapolation to the large-volume/ continuum limit, tailored to near-conformal theories.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - 26 Apr 2013|