Lattice2010

Session

Parallel 14: Applications beyond QCD

19

15 Jun 2010, 10:30

Villasimius, Sardinia

33. New results with colour-sextet quarks

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...

152. PERTURBATIVE IMPROVEMENT OF SU(2) GAUGE THEORY WITH TWO WILSON FERMIONS IN ADJOINT REPRESENTATION

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)...

10. Lattice QCD with 8 and 12 Degenerate Quark Flavors

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...

222. Search for the IR fixed point in the Twisted Polyakov Loop scheme (II)

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 ($\beta \ge 4.5$) 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...

96. Sextet QCD: slow running and the mass anomalous dimension

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.