Nonperturbative $O(a)$ improvement of the Wilson quark action with the RG-improved gauge action using the Schrödinger functional method

Details Nonperturbative $O(a)$ improvement of the Wilson quark action with the RG-improved gauge action using the Schrödinger functional method Nonperturbative $O(a)$ improvement of the Wilson quark action with the RG-improved gauge action using the Schrödinger functional method

2005-08-31

arxiv.org/abs/hep-lat/0508031v2

Phys.Rev.D73:034501,2006

Physics

High Energy Physics

High Energy Physics - Lattice

27 pages, 5 figures. Version appearing in PRD. \beta dependence of c_sw and kappa_c in two flavor QCD is reanalyzed with a dif

Scientific paper

10.1103/PhysRevD.73.034501

We perform a nonperturbative determination of the $O(a)$-improvement coefficient $c_{\rm SW}$ and the critical hopping parameter $\kappa_c$ for $N_f$=3, 2, 0 flavor QCD with the RG-improved gauge action using the Schr\"odinger functional method. In order to interpolate $c_{\rm SW}$ and $\kappa_c$ as a function of the bare coupling, a wide range of $\beta$ from the weak coupling region to the moderately strong coupling points used in large-scale simulations is studied. Corrections at finite lattice size of $O(a/L)$ turned out to be large for the RG-improved gauge action, and hence we make the determination at a size fixed in physical units using a modified improvement condition. This enables us to avoid $O(a)$ scaling violations which would remain in physical observables if $c_{\rm SW}$ determined for a fixed lattice size $L/a$ is used in numerical simulations.

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