Wed·Sep 14, 2005Wednesday·September 14, 2005

1. 01*

   Color Confinement in lattice Landau gauge with unquenched Wilson and KS fermions

   Hideo Nakajima🇯🇵 · Sadataka Furui🇯🇵

   The Kugo-Ojima confinement criterion is verified in the unquenched Landau gauge QCD simulation. The valence quark propagator of the Kogut-Susskind fermion with use of the fermion action including the Naik term and the staple contribution is calculated on MILC Asqtad unquenched gauge configurations, and it shows infrared suppression of the quark propagator.

   hep-latPoS(2006)·2 citations
2. 02*

   The IR gluon propagator from lattice QCD

   P. J. Silva🇵🇹 · O. Oliveira🇵🇹

   The gluon propagator is computed in large asymmetric lattices, accessing momenta around 100 MeV and smaller. Our study tries to check the compatibility of the recent solutions of the gluon-ghost Dyson-Schwinger equations with lattice results. In particular the exponent $\kappa$, which characterizes the solutions for the infrared, is measured. Results favours a vanishing zero momentum gluon propagator. We also report on the compatibility of various functional forms used to fit the Dyson-Schwinger solution for the full range of momenta and the lattice gluon propagator.

   hep-latPoS(2006)·10 citations
3. 03*

   The running coupling in lattice Landau gauge with unquenched Wilson fermion and KS fermion

   Sadataka Furui🇯🇵 · Hideo Nakajima🇯🇵

   The running coupling of the Wilson fermon(JLQCD/CP-PACS) and that of Kogut-Susskind(KS) fermion(MILC) are measured in the lattice Landau gauge QCD in $\widetilde{MOM}$ scheme. The quark propagator of the KS fermion is also measured and we find that it is infrared suppressed. The renormalization factor of the running coupling and the tadpole renormalization define the scale of the quark wave function. Effects of the $A_{\mu }^2$ condensates of a few GeV${}^2$ are observed in the running coupling and also in the quark propagator.

   hep-latPoS(2006)·11 citations
4. 04*

   Twisted mass fermions: neutral pion masses from disconnected contributions

   F. Farchioni🇩🇪 · K. Jansen🇩🇪 · C. McNeile🇬🇧 · C. Michael🇬🇧 · I. Montvay🇩🇪 · K. Nagai🇩🇪 · M. Papinutto🇩🇪 · J. Pickavance🇩🇪 · E. Scholz🇺🇸 · L. Scorzato🇩🇪 · A. Shindler🇩🇪 · N. Ukita🇩🇪 and 3 other authors

   Twisted mass fermions allow light quarks to be explored but with the consequence that there are mass splittings, such as between the neutral and charged pion. Using a direct calculation of the connected neutral pion correlator and stochastic methods to evaluate the disconnected correlations, we determine the neutral pion mass. We explore the dependence on lattice spacing and quark mass in quenched QCD. For dynamical QCD, we determine the sign of the splitting which is linked, via chiral PT, to the nature of the phase transition at small quark mass.

   hep-latPoS(2006)·17 citations
5. 05*

   Finite volume effects in the gluon propagator

   O. Oliveira🇵🇹 · P. J. Silva🇵🇹

   We report on a preliminary study of the volume dependence of the gluon propagator. The propagator is computed using different lattice volumes, its extrapolation to infinite volume is investigated with particular attention to the its IR behaviour. Our data shows a mild but measurable dependence with the volume. Unfortunately, we are not able yet to clarify its behaviour close to zero momentum.

   hep-latPoS(2006)·18 citations
6. 06*

   Fermion propagators in QED3 with velocity anisotropies

   Iorwerth Owain Thomas🇬🇧 · Simon Hands (University of Wales Swansea)🇬🇧

   QED3 with fermi and gap anisotropies is considered to be a candidate effective field theory of high temperature superconductors. Simulations of a variant of the theory have demonstrated that there is evidence consistent with a phase transition to a chirally restored phase as the velocity anisotropy increases, and that the correlation lengths of pions in spatial directions behave in a manner consistent with the anisotropy being a relevant parameter of the theory. We present the first measurements of the fermion propagator in Landau gauge for this theory and suggest that the structure of this theory is more complex than previously thought.

   hep-latcond-mat.str-elcond-mat.supr-conPoS(2006)·3 citations
7. 07*

   Large Wilson loops with overlap and clover fermions: Two-loop evaluation of the b-quark mass shift and the quark-antiquark potential

   A. Athenodorou🇨🇾 · H. Panagopoulos (Dept. of Physics, University of Cyprus, Nicosia)🇨🇾

   We compute, to two loops in pertubation theory, the fermionic contribution to rectangular RxT Wilson loops, for different values of R and T. We use the overlap fermionic action. We also employ the clover action, for comparison with existing results in the literature. In the limit R, T -> Infinity our results lead to the shift in the b-quark mass. We also evaluate the perturbative static potential as T -> Infinity.

   hep-latNPB(2008)·6 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.