Lambda_msbar from the static potential for QCD with n_f=2 dynamical quark flavors

Details Lambda_msbar from the static potential for QCD with n_f=2 dynamical quark flavors Lambda_msbar from the static potential for QCD with n_f=2 dynamical quark flavors

2011-10-31

arxiv.org/abs/1110.6859v3

JHEP 1201:025,2012

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 7 figures; reference added

Scientific paper

10.1007/JHEP01(2012)025

We determine Lambda_msbar for QCD with n_f=2 dynamical quark flavors by fitting the Q-Q-bar static potential known analytically in the perturbative regime up to terms of O(alpha_s^4) and ~alpha_s^4 ln(alpha_s) to corresponding results obtained from lattice simulations. This has become possible, due to recent advances in both perturbative calculations, namely the determination and publication of the last missing contribution to the Q-Q-bar static potential at O(alpha_s^4), and lattice simulations with n_f=2 dynamical quark flavors performed at the rather fine lattice spacing of a~0.042 fm. Imposing conservative error estimates we obtain Lambda_msbar=315(30) MeV.

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