Nonperturbative infrared fixed point in sextet QCD

Benjamin Svetitsky, Yigal Shamir, Thomas DeGrand

Research output: Contribution to journalConference articlepeer-review


The SU(3) gauge theory with fermions in the sextet representation is one of several theories of interest for technicolor models. We have carried out a Schrodinger functional (SF) calculation for the lattice theory with two flavors of Wilson fermions. We find that the discrete beta function changes sign when the SF renormalized coupling is in the neighborhood of g2 = 2.0, showing a breakdown of the perturbative picture even though the coupling is weak. The most straightforward interpretation is an infrared-stable fixed point.

Original languageEnglish
JournalProceedings of Science
StatePublished - 2008
Event26th International Symposium on Lattice Field Theory, LATTICE 2008 - Williamsburg, United States
Duration: 14 Jul 200819 Jul 2008


FundersFunder number
US Department of Energy
Israel Science Foundation173/05


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