327 citations
- Universidad de SevillaES77 papers
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6 papers · 2 filters
The strong coupling constant at small momentum as an instanton detector
Ph. Boucaud, F. De Soto, A. Le Yaouanc +5
We present a study of at small p computed from the lattice. It shows a dramatic law which can be understood within an instanton liquid model. In this fra…
O.P.E. and Power Corrections to the QCD coupling constant
Ph. Boucaud, F. De Soto, A. Donini +6
Lattice data seems to show that power corrections should be convoked to describe appropriately the transition of the QCD coupling constant running from U.V. to I.R. domains. Those…
An Instanton Picture O.P.E. <A^2> Condensate?
Ph. Boucaud, F. De Soto, A. Donini +6
Gluon two- and three-point Green Functions computed in Landau gauge from the lattice show the existence of power corrections to the purely perturbative expressions, that can be exp…
A transparent expression of the A^2-Condensate's renormalisation
Ph. Boucaud, F. De Soto, A. Le Yaouanc +5
We give a more transparent understanding of the vacuum expectation value of the renormalised local operator A^2 by relating it to the gluon propagator integrated over the momentum.…
First lattice QCD estimate of the g_{D^* D pi} coupling
A. Abada, D. Becirevic, Ph. Boucaud +5
We present the results of the first lattice QCD study of the strong coupling g_{D^* D pi}. From our simulations in the quenched approximation, we obtain g_{D^* D pi} = 18.8 +/- 2.3…
Instantons and Condensate
Ph. Boucaud, J. P. Leroy, A. Le Yaouanc +6
We argue that the condensate found in the Landau gauge on lattices, when an Operator Product Expansion of Green functions is performed, might be explained by inst…