Determination of $Λ_{\overline{MS}}$ from quenched and $N_f = 2$ dynamical QCD

Booth, S.; Göckeler, M.; Horsley, R.; Irving, A. C.; Joo, B.; Pickles, S.; Pleiter, D.; Rakow, P. E. L.; Schierholz, G.; Sroczynski, Z.; Stüben, H.

Determination of $Λ_{\overline{MS}}$ from quenched and $N_f = 2$ dynamical QCD

Authors

Description

The scale parameter $Λ_{\overline{MS}}$ is computed on the lattice in the quenched approximation and for $N_f = 2$ flavors of light dynamical quarks. The dynamical calculation is done with non-perturbatively $O(a)$ improved Wilson fermions. In the continuum limit we obtain $Λ_{\overline{MS}}^{N_f=0} = 243(1)(10)$ MeV and $Λ_{\overline{MS}}^{N_f=2} = 217(16)(11)$ MeV, respectively.
16 pages, 6 figures. Minor changes. Final version to be published in Phys. Lett. B