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

Attila Nagy; ETM Collaboration: Karl Jansen; Felix Karbstein; Marc Wagner

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

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arxiv 1110.6859 v3 pith:EHA7JQ5A submitted 2011-10-31 hep-ph hep-lat

ETM Collaboration: Karl Jansen , Felix Karbstein , Attila Nagy , Marc Wagner This is my paper · ORCID

classification hep-phhep-lat

keywords alphadynamicalflavorslambdalatticemsbarpotentialquark

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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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