202 research outputs found
Improving chiral property of domain-wall fermions by reweighting method
The reweighting method is applied to improve the chiral property of
domain-wall fermions. One way to achieve this is to enlarge , the size of
fifth dimension, which controls the size of the induced chiral symmetry
breaking. While this is a type of reweighting method for shifting the action
parameter, it seems non-trivial since this reweighting means change of the five
dimensional lattice volume. In this report, we address issues in this direction
of reweighting and evaluate its effectiveness.Comment: 7 pages, talk presented at The XXVII International Symposium on
Lattice Field Theory, July 26-31 2009, Peking University, Beijing, Chin
Lattice QCD with Domain-Wall Fermions
We study the quenched lattice QCD using domain-wall fermions at .
Behaviors of both pion mass and the explicit breaking term in the axial
Ward-Takahashi identity support the existence of the chiral zero modes. We
observe a good agreement between the pion decay constants from both the
conserved axial current and the local current perturbatively renormalized at
1-loop. Finally the possible existence of the parity broken phase is also
examined in this model.Comment: LATTICE99 (Chiral Fermions), 3 page
B_K from Two-flavor Dynamical Domain Wall Fermions
We report preliminary results from an ongoing calculation of for
dynamical QCD with domain wall fermions. Simulations have been done
with three dynamical quark masses on volumes with ,
where the lattice spacing is GeV. Using measurements on
lattices for each dynamical mass and extrapolating \mdyn=\mval to
the kaon point, we find .Comment: Lattice2003(matrix), 3 pages, 2 figure
Lattice Gross-Neveu model with domain-wall fermions
We investigate the two-dimensional lattice Gross-Neveu model, using the
domain-wall fermion formulation, as a toy model of lattice QCD. We study
features of the phase diagram related to the mechanism of chiral symmetry
restoration, and find that the parity-broken phase (Aoki phase) exists for
finite extent in the extra dimension (). We also find that O(a) scaling
violation terms vanishes in the limit of .Comment: LATTICE99 (Chiral Fermions), 3 pages, 4 figure
Two-dimensional Lattice Gross-Neveu Model with Wilson Fermion Action at Finite Temperature and Chemical Potential
We investigate the phase structure of the two-dimensional lattice Gross-Neveu
model formulated with the Wilson fermion action to leading order of 1/N
expansion. Structural change of the parity-broken phase under the influence of
finite temperature and chemical potential is studied. The connection between
the lattice phase structure and the chiral phase transition of the continuum
theory is clarified.Comment: 42 pages, 20 EPS figures, using REVTe
Double poles in Lattice QCD with mixed actions
We consider effects resulting from the use of different discretizations for
the valence and the sea quarks, considering Wilson and/or Ginsparg--Wilson
fermions. We assume that such effects appear through scaling violations that
can be studied using effective-lagrangian techniques. We show that a double
pole is present in flavor-neutral Goldstone meson propagators, even if the
flavor non-diagonal Goldstone mesons made out of valence or sea quark have
equal masses. We then consider some observables known to be anomalously
sensitive to the presence of a double pole. We find that the double-pole
enhanced scaling violations may turn out to be rather small in practice.Comment: 8 pages; combined writeup of talks given at Lattice 2005 (Dublin) and
the Workshop on Computational Hadron Physics (Cyprus
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