Now showing items 1-5 of 5

    • IconAn instanton picture O.P.E. (A2) condensate?  [Article]

      Rodríguez Quintero, José; Pène, Olivier; Moutarde, H.; Micheli, J.; Le Yaouanc, A.; Leroy, J. P.; Donini, A.; Boucaud, Ph.; Soto Borrero, Feliciano Carlos de (Elsevier, 2003)
      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 explained through an Operator Product Expansion ...
    • IconArtifacts and ⟨A2⟩ power corrections: Reexamining Zψ(p2) and ZV in the momentum-subtraction scheme  [Article]

      Boucaud, Ph.; de Soto, F.; Leroy, J. P.; Le Yaouanc, A.; Micheli, J,; Moutarde, H.; Pène, Olivier; Rodríguez Quintero, J. (American Physical Society, 2006-08-17)
      The next-to-leading-order (NLO) term in the operator product expansion (OPE) of the quark propagator vector part Zψ and the vertex function g1 of the vector current in the Landau gauge should be dominated by the same ⟨A2⟩ ...
    • IconInstantons and the ⟨A2⟩ condensate  [Article]

      Boucaud, Ph.; Leroy, J. P.; Le Yaouanc, A.; Micheli, A.; Pène, Olivier; de Soto, F.; Donini, A.; Moutarde, H.; Rodríguez Quintero, J. (American Physical Society, 2002-12-01)
      We argue that the ⟨A2OPE⟩ condensate found in the Landau gauge on lattices, when an operator product expansion of Green’s functions is performed, might be explained by instantons. We use cooling to estimate the instanton ...
    • IconThe strong coupling constant at small momentum as an instanton detector  [Article]

      Boucaud, Ph.; de Soto, F.; Le Yaouanc, A.; Leroy, J. P.; Micheli, J.; Moutarde, H.; Pène, Olivier; Rodríguez Quintero, J. (Springer Verlag, 2003)
      We present a study of αMOM(p) at small p computed from the lattice in the quenched approximation (nf = 0). It shows a dramatic ∝ p4 law which can be understood within an instanton liquid model. In this framework the prefactor ...
    • IconTransparent expression of the A2 condensate’s renormalization  [Article]

      Boucaud, Ph.; de Soto, F.; Le Yaouanc, A.; Leroy, J. P.; Micheli, J.; Moutarde, H.; Pène, Olivier; Rodríguez Quintero, J. (American Physical Society, 2003-12-01)
      We give a more transparent understanding of the vacuum expectation value of the renormalized local operator A2 by relating it to the gluon propagator integrated over the momentum. The quadratically divergent perturbative ...