Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-12-02
Phys.Rev.D79:074008,2009
Physics
High Energy Physics
High Energy Physics - Lattice
10 pages, 5 figures. Minor corrections suggested by referee
Scientific paper
10.1103/PhysRevD.79.074008
We perform a perturbative calculation of the influence of dynamical HISQ fermions on the perturbative improvement of the gluonic action in the same way as we have previously done for asqtad fermions. We find the fermionic contributions to the radiative corrections in the Luescher-Weisz gauge action to be somewhat larger for HISQ fermions than for asqtad. Using one-loop perturbation theory as a test, we estimate that omission of the fermion-induced radiative corrections in dynamical asqtad simulations will give a measurable effect. The one-loop result gives a systematic shift of about -0.6% in (r_1/a) on the coarsest asqtad improved staggered ensembles. This is the correct sign and magnitude to explain the scaling violations seen in Phi_B on dynamical lattice ensembles.
Hart Alexa
Horgan Ronald R.
von Hippel Georg M.
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