Mass anomalous dimension in sextet QCD

Thomas Degrand, Yigal Shamir, Benjamin Svetitsky

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number074507
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume87
Issue number7
DOIs
StatePublished - 26 Apr 2013

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