Tuesday, January 1, 2013

1201.0935 (Thomas DeGrand et al.)

Mass anomalous dimension in sextet QCD    [PDF]

Thomas DeGrand, Yigal Shamir, Benjamin Svetitsky
We extend our previous study of the SU(3) gauge theory with N_f=2 flavors of fermions in the sextet representation of color. Our tool is the Schroedinger 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 gamma_m over a wider range of coupling, out to g^2 ~ 11. Our results are consistent with an infrared fixed point, but walking is not ruled out. Our main result is that gamma_m never exceeds 0.45, making the model unsuitable for walking technicolor. We give an extensive discussion of discretization error.
View original: http://arxiv.org/abs/1201.0935

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