Nonperturbative infrared fixed point in sextet QCD

Details Nonperturbative infrared fixed point in sextet QCD Nonperturbative infrared fixed point in sextet QCD

2008-09-17

arxiv.org/abs/0809.2885v2

PoS LATTICE2008:062,2008

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 4 figures, presented at Lattice 2008, Williamsburg, Virginia

Scientific paper

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 g^2 = 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.

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