Computation of the strong coupling in QCD with two dynamical flavours
Michele Della Morte, Roberto Frezzotti, Jochen Heitger, Juri Rolf,, Rainer Sommer, Ulli Wolff (ALPHA Collaboration)
TL;DR
This paper non-perturbatively computes the running of the strong coupling constant in QCD with two dynamical flavors, providing improved continuum extrapolation and an estimate of the Lambda-parameter in the MSbar scheme.
Contribution
It presents a refined non-perturbative calculation of the QCD coupling's running with two flavors, including a reliable continuum limit and an estimate of Lambda in the MSbar scheme.
Findings
Lambda_{MSbar}^{(2)}=245(16)(16) MeV estimate
Continuum extrapolation improves previous results
Lattice spacings from 0.07 to 0.1 fm used
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.
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