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Browsing by Author "Boucaud, Ph."
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An Instanton Picture O.P.E. (A2) Condensate?
Boucaud, Ph.; De Soto, F.; Donini, A.; Rodríguez Quintero, José
(Elsevier, 2003-05)
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 ... -
Comment on “Lattice Gluon and Ghost Propagators, and the Strong Coupling in Pure SU (3) Yang-Mills Theory : Finite Lattice Spacing and Volume Effects
Boucaud, Ph.; Soto Borrero, Feliciano Carlos de; Rodríguez Quintero, José; Zafeiropoulos, S. (American Physical Society, 2017)
The authors of [Phys. Rev. D 94, 014502 (2016)] reported about a careful analysis of the impact of lattice artifacts on the SU(3) gauge-field propagators. In particular, they found that the low-momentum behavior of the ... -
Discretization effects on renormalized gauge-field Green’s functions, scale setting, and the gluon mass
Boucaud, Ph.; Soto, F. de; Raya, Khépani; Rodríguez Quintero, José (American Physical Society, 2018-12)
The SUð3Þ gauge-field propagators computed from the lattice have been exhaustively used in the investigation of the low-momentum dynamics of QCD, in a judicious interplay with results from other nonperturbative approaches, ... -
Divergent IR gluon propagator from Ward-Slavnov-Taylor identities?
Boucaud, Ph.; Leroy, J. P.; Le Yaouanc, Alain; Rodríguez Quintero, José (Springer Verlag, 2007-03)
We exploit the Ward-Slavnov-Taylor identity relating in genaral covariant gauges the 3-gluons to the ghost-gluon vertices to conclude either that the ghost dressing function is finite and non vanishing at zero momentum ... -
Ghost-gluon coupling, power corrections and Ams from lattice QCD with a dynamical charm
Blossier, B.; Boucaud, Ph.; Brinet, M.; Soto Borrero, Feliciano Carlos de; Du, X.; Gravina, M.; Morenas, V.; Pène, O.; Petrov, K.; Rodríguez Quintero, José (American Physical Society, 2012)
We present results concerning the nonperturbative evaluation of the ghost-gluon running QCD coupling constant from Nf=2 twisted-mass lattice calculations. A novel method for calibrating the lattice spacing, independent of ... -
Gluon Green functions free of quantum fluctuations
Athenodorou, A.; Boucaud, Ph.; Soto Borrero, Feliciano Carlos de; Rodríguez Quintero, José; Zafeiropoulos, S. (Elsevier, 2016)
This letter reports on how the Wilson flow technique can efficaciously kill the short-distance quantum fluctuations of 2- and 3-gluon Green functions, remove the ΛQCDΛQCD scale and destroy the transition from the confining ... -
High statistics determination of the strong coupling constant in Taylor scheme and its OPE Wilson coe cient from lattice QCD with a dynamical charm
Blossier, B.; Boucaud, Ph.; Brinet, M.; Soto Borrero, Feliciano Carlos de; Morenas, V.; Pène, O.; Petrov, K.; Rodríguez Quintero, José (American Physical Society, 2014)
This paper reports on the determination of S from lattice simulations with 2+1+1 twisted-mass dynamical avours via the computation of the ghost-gluon coupling renormalized in the MOM Taylor scheme. A high-statistics ... -
Instanton liquid properties from lattice QCD
Athenodorou, A.; Boucaud, Ph.; De Soto, F.; Rodríguez Quintero, José; Zafeiropoulos, S. (Springer Verlag, 2018-02)
We examined the instanton contribution to the QCD con gurations generated from lattice QCD for NF = 0, NF = 2 + 1 and NF = 2 + 1 + 1 dynamical quark avors from two di erent and complementary approaches. First via the ... -
Instantons and the A (2) condensate
Boucaud, Ph.; Leroy, J. P.; Le Yaouanc, Alain; Micheli, J.; Pène, O.; Soto Borrero, Feliciano Carlos de; Donini, A.; Moutarde, Hervé; Rodríguez Quintero, José (American Physical Society, 2002)
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 ... -
IR finiteness of the ghost dressing function from numerical resolution of the ghost SD equation
Boucaud, Ph.; Leroy, J. P.; Le Yaouanc, Alain; Micheli, J.; Pène, O.; Rodríguez Quintero, José (Springer Verlag, 2008-06)
We solve numerically the Schwinger-Dyson ghost equation in the Landau gauge for a given, finite at k = 0 gluon propagator (i.e. the infrared exponent of its dressing function, αgluon, is 1) and under the usual assumption ... -
Lattice calculation of 1/p² corrections to αs and of ΛQCD in the MOM scheme.
Boucaud, Ph.; Burgio, Giuseppe; Di Renzo, Francesco; Rodríguez Quintero, José (Springer Verlag, 2000-04)
We report on very strong evidence of the occurrence of power terms in α^MOM(p), the QCD running coupling constant in the ^MOM scheme, by analyzing non-perturbative measurements from the lattice three-gluon vertex between ... -
Modified instanton profile effects from lattice Green functions
Boucaud, Ph.; De Soto, F.; Le Yaouanc, Alain; Rodríguez Quintero, José (American Physical Society, 2004-12)
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 ... -
Novel method for the physical scale setting on the lattice and its application to Nf=4 simulations
Blossier, B.; Boucaud, Ph.; Brinet, M.; Soto Borrero, Feliciano Carlos de; Morenas, V.; Pène, O.; Petrov, K.; Rodríguez Quintero, José (American Physical Society, 2014)
This paper reports on a new procedure for the lattice spacing setting that takes advantage of the very precise determination of the strong coupling in the Taylor scheme. Although it can be applied for the physical scale ... -
On the IR behaviour of the Landau-gauge ghost propagator
Boucaud, Ph.; Leroy, J. P.; Le Yaouanc, Alain; Micheli, J.; Pène, O.; Rodríguez Quintero, José (Springer Verlag, 2008-06)
We examine analytically the ghost propagator Dyson-Schwinger Equation (DSE) in the deep IR regime and prove that a finite ghost dressing function at vanish- ing momentum is an alternative solution (solution II) to the ... -
On the leading OPE corrections to the ghost-gluon vertex and the Taylor theorem
Boucaud, Ph.; Dudal, D.; Leroy, J. P.; Pène, O.; Rodríguez Quintero, José (Springer Verlag, 2011)
This brief note is devoted to a study of genuine non-perturbative corrections to the Landau gauge ghost-gluon vertex in terms of the non-vanishing dimension-two gluon condensate. We prove these corrections to give account ... -
On the zero crossing of the three-gluon vertex
Athenodorou, A.; Binosi, Daniele; Boucaud, Ph.; Soto Borrero, Feliciano Carlos de; Rodríguez Quintero, José; Zafeiropoulos, S. (Elsevier, 2016)
We report on new results on the infrared behavior of the three-gluon vertex in quenched Quantum Chromodynamics, obtained from large-volume lattice simulations. The main focus of our study is the appearance of the characteristic ... -
Quark propagator and vertex: systematic corrections of hypercubic artifacts from lattice simulations
Boucaud, Ph.; De Soto, F.; Leroy, J. P.; Rodríguez Quintero, José (Elsevier, 2003-11)
This is the first part of a study of the quark propagator and the vertex function of the vector current on the lattice in the Landau gauge and using both Wilson-clover and overlap actions. In order to be able to identify ... -
Refining the detection of the zero crossing for the three-gluon vertex in symmetric and asymmetric momentum subtraction schemes
Boucaud, Ph.; Soto Borrero, Feliciano Carlos de; Rodríguez Quintero, José; Zafeiropoulos, S. (American Physical Society, 2017)
This article reports on the detailed study of the three-gluon vertex in four-dimensional SU(3) Yang-Mills theory employing lattice simulations with large physical volumes and high statistics. A meticulous scrutiny of the ... -
Renormalization of quark propagators from twisted-mass lattice QCD at N-f=2
Blossier, B.; Boucaud, Ph.; Brinet, M.; Soto Borrero, Feliciano Carlos de; Liu, Z.; Morenas, V.; Pène, O.; Petrov, K.; Rodríguez Quintero, José (American Physical Society, 2011)
We present results concerning the nonperturbative evaluation of the renormalization constant for the quark field, Z(q), from lattice simulations with twisted-mass quarks and three values of the lattice spacing. We use the ... -
The strong coupling constant at small momentum as an instanton detector
Boucaud, Ph.; Le Yaouanc, Alain; Leroy, J. P.; Micheli, J.; Pène, O.; Soto Borrero, Feliciano Carlos de; Moutarde, Hervé; Rodríguez Quintero, José (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 proptop4 law which can be understood within an instanton liquid model. In this framework the ...
