TY - JOUR
T1 - Mass anomalous dimension in sextet QCD
AU - Degrand, Thomas
AU - Shamir, Yigal
AU - Svetitsky, Benjamin
PY - 2013/4/26
Y1 - 2013/4/26
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84877134389&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.87.074507
DO - 10.1103/PhysRevD.87.074507
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AN - SCOPUS:84877134389
SN - 1550-7998
VL - 87
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 7
M1 - 074507
ER -