Sextet QCD: slow running and the mass anomalous dimension
Benjamin Svetitsky, Yigal Shamir (Tel Aviv U.), Thomas DeGrand, (Colorado U.)
TL;DR
This study investigates the infrared behavior of SU(3) gauge theory with two sextet fermions, finding very slow coupling evolution which facilitates the measurement of the mass anomalous dimension, despite not confirming an infrared fixed point.
Contribution
The paper provides new Schroedinger functional calculations using nHYP fat links, offering insights into slow coupling evolution and the mass anomalous dimension in sextet QCD.
Findings
Coupling constant evolves very slowly
Infrared fixed point not confirmed with fat links
Mass anomalous dimension can be reliably extracted
Abstract
I report the results of Schroedinger functional calculations in the SU(3) gauge theory with two flavors of color sextet fermions, defined with the Wilson-clover action using nHYP fat links. While we cannot confirm the infrared fixed point seen with thin links, we find very slow evolution of the coupling constant, so slow that extraction of the mass anomalous dimension is straightforward.
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