On-shell improved lattice QCD with staggered fermions

Details On-shell improved lattice QCD with staggered fermions On-shell improved lattice QCD with staggered fermions

1997-02-13

arxiv.org/abs/hep-lat/9702013v2

Phys.Rev. D57 (1998) 265-275

Physics

High Energy Physics

High Energy Physics - Lattice

18 pages, revtex, 5 figure

Scientific paper

10.1103/PhysRevD.57.265

By using Symanzik's improvement program, we study on-shell improved lattice QCD with staggered fermions. We find that there are as many as 15 independent lattice operators of dimension of six~(including both gauge and fermion operators) which must be added to the unimproved action to form an $O(a^2)$ improved action. Among them, the total number of dimension-6 gauge operators and fermion bilinears is 5. The other 10 terms are four-fermion operators. At the tree-level and tadpole-improved tree-level, all the 10 four fermion operators are absent.

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