Tests of Hypercubic Fermion Actions
نویسنده
چکیده
I have performed scaling tests using quenched spectroscopy of a family of fermion actions which have a hypercubic kinetic term, gauge connections built of smeared links, and an anomalous magnetic moment term. These actions show improved rotational invariance compared to the standard Wilson action and to the tadpole-improved clover action. Hyperfine splittings are improved compared to the standard Wilson action (at the level of a factor of three in the lattice spacing), and are about the same as for the tadpole-improved clover action.
منابع مشابه
Simple Observables from Fat Link Fermion Actions
This paper is a continuation of earlier work [1,2] studying the properties of a particular type of improved action for studies of quenched QCD, with fermion-gauge field couplings parameterized by “fat links,” and a lattice anomalous magnetic moment “clover” term. One of the actions studied here has fermionic couplings extending over a hypercube. The other action is the fat link clover action. B...
متن کاملLocal chiral fermions
Borici’s construction of minimally doubled chiral fermions builds on a linear combination of two unitarily related naive fermion actions. Being strictly local, extremely efficient numerical implementation should be possible. The resulting system is symmetric under the subgroup of the hypercubic group that preserves a major hypercube diagonal. The symmetry includes both parity even and odd trans...
متن کاملUnquenched domain wall quarks with TSMB
Lattice actions with improved chiral properties offer the perspective of QCD simulations with a better control of chiral symmetry at non-zero lattice spacings. A prototype is the domain wall fermion action [1–3] defined on a five dimensional hypercubic lattice. Following Shamir’s formulation [3], the light chiral fermion modes are located on two boundaries of the fifth dimension. The price of t...
متن کاملar X iv : h ep - l at / 9 31 10 16 v 1 1 6 N ov 1 99 3 1 Fixed Point Actions for Lattice Fermions
The fixed point actions for Wilson and staggered lattice fermions are determined by iterating renormalization group transformations. In both cases a line of fixed points is found. Some points have very local fixed point actions. They can be used to construct perfect lattice actions for asymptotically free fermionic theories like QCD or the Gross-Neveu model. The local fixed point actions for Wi...
متن کاملLattice Fermions and the Chiral Anomaly
We show in the Wilson model that the contribution of the regular mass term to the four-divergence of the axial vector current in weak coupling perturbation theory is not zero in the chiral limit and precisely is the axial anomaly. Explicit breaking of chiral symmetry in the Wilson term is not relevant for the result. The ABJ anomaly is generated by the fermion mass term also with a chirally sym...
متن کامل