We present a non-perturbative computation of the running of the coupling alpha_s in QCD with two flavours of dynamical fermions in the Schroedinger functional scheme. We improve our previous results by a reliable continuum extrapolation. The Lambda-parameter characterizing the high-energy running is related to the value of the coupling at low energy in the continuum limit. An estimate of Lambda*r_0 is given using large-volume data with lattice spacings a from 0.07 fm to 0.1 fm. It translates into Lambda_{MSbar}^{(2)}=245(16)(16) MeV [assuming r_0=0.5 fm]. The last step still has to be improved to reduce the uncertainty.

Della Morte, M., Frezzotti, R., Heitger, J., Rolf, J., Sommer, R., Wolff, U. (2005). Computation of the strong coupling in QCD with two dynamical flavors. NUCLEAR PHYSICS. B, 713(1-3), 378-406 [10.1016/j.nuclphysb.2005.02.013].

Computation of the strong coupling in QCD with two dynamical flavors

FREZZOTTI, ROBERTO;
2005-01-01

Abstract

We present a non-perturbative computation of the running of the coupling alpha_s in QCD with two flavours of dynamical fermions in the Schroedinger functional scheme. We improve our previous results by a reliable continuum extrapolation. The Lambda-parameter characterizing the high-energy running is related to the value of the coupling at low energy in the continuum limit. An estimate of Lambda*r_0 is given using large-volume data with lattice spacings a from 0.07 fm to 0.1 fm. It translates into Lambda_{MSbar}^{(2)}=245(16)(16) MeV [assuming r_0=0.5 fm]. The last step still has to be improved to reduce the uncertainty.
2005
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/02 - FISICA TEORICA, MODELLI E METODI MATEMATICI
English
QCD, strong coupling, QCD Lambda parameter, lattice field theory
http://arxiv.org/abs/hep-lat/0411025v1
Della Morte, M., Frezzotti, R., Heitger, J., Rolf, J., Sommer, R., Wolff, U. (2005). Computation of the strong coupling in QCD with two dynamical flavors. NUCLEAR PHYSICS. B, 713(1-3), 378-406 [10.1016/j.nuclphysb.2005.02.013].
Della Morte, M; Frezzotti, R; Heitger, J; Rolf, J; Sommer, R; Wolff, U
Articolo su rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/56737
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