Now showing items 1-4 of 4

    • 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 ...
    • IconModified instanton profile effects from lattice Green functions  [Article]

      Boucaud, Ph.; de Soto, F.; Le Yaouanc, A.; Leroy, J. P.; Micheli, J.; Pène, Olivier; Rodríguez Quintero, J. (American Physical Society, 2004-12-01)
      We trace here instantons through the analysis of pure Yang-Mills gluon Green functions in the Landau gauge for a window of IR momenta (0.4<k<0.9  GeV). We present lattice results that can be fitted only after substituting ...
    • 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 ...