Donald Sinclair
(Argonne National Laboratory)
15/06/2010, 10:30
Applications beyond QCD
We have been studying lattice QCD with colour-sextet staggered quarks, as a model for conformal/walking
technicolor. We are studying the thermodynamics of these theories and using the positions of the deconfinement
and chiral transitions to try to distinguish between conformal and walking behaviour. Our preliminary simulations
with N_f=2, on N_t=4 and N_t=6 lattices, favoured the walking...
Tuomas Karavirta
(University of Jyväskylä)
15/06/2010, 10:50
Applications beyond QCD
Recently there has been lot of interest in quantum field theories whose renormalization group evolution is governed by an infrared stable fixed point. This is motivated by phenomenological applications in unparticles and walking technicolor. As a continuation of an initial lattice studies of the two-color gauge theory with two adjoint Dirac flavors, we have carried out perturbative O(a)...
Xiao-Yong Jin
(Columbia University)
15/06/2010, 11:10
Applications beyond QCD
We summarize our study of QCD with 8 and 12 flavors
of degenerate quarks at zero temperature, using the DBW2 gauge
action and naive staggered fermions, along with the rational
hybrid Monte Carlo algorithm. From measurements of hadron
masses, decay constants and other low energy observables, we
conclude that such a system with 8 and 12 flavors breaks chiral
symmetry and exhibits...
Etsuko Itou
(Osaka University)
15/06/2010, 11:30
Applications beyond QCD
We present our updated study of the nonperturbative running coupling constant in Twisted Polyakov Loop (TPL) scheme.
We study the larger lattice size and the lower $\beta$ region ($\beta
\geq 4.5$) in the case of SU(3) Nf=12.
We discuss in detail the step scaling function, the running coupling constant, and the nonperturbative beta function using these updated data.
We also discuss the...
Benjamin Svetitsky
(Tel Aviv University)
15/06/2010, 11:50
Applications beyond QCD
I report the results of Schrodinger 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.
