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Browsing by Author "Pène, O."
Now showing items 1-15 of 15
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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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Strong Running Coupling at τ and Z 0 Mass Scales from Lattice QCD
Blossier, B.; Boucaud, Ph.; Brinet, M.; Soto Borrero, Feliciano Carlos de; Du, X.; Morenas, V.; Pène, O.; Petrov, K.; Rodríguez Quintero, José (American Physical Society, 2012)
This Letter reports on the first computation, from data obtained in lattice QCD with u, d, s, and c quarks in the sea, of the running strong coupling via the ghost-gluon coupling renormalized in the momentum-subtraction ... -
Testing OPE for ghosts, gluons and αs
Petrov, K.; Blossier, B.; Pène, O.; Rodríguez Quintero, José (Sissa Medialab, 2012-10)
We present here our results on extracting Wilson coefficients from different quantities such as ghost and gluon propagators which are calculated by means of Lattice QCD. The results confirm the validity of our method for ... -
Three-gluon running coupling from lattice QCD at Nf = 2 + 1 + 1: a consistency check of the OPE approach
Boucaud, Ph.; Brinet, M.; Soto Borrero, Feliciano Carlos de; Morenas, V.; Pène, O.; Petrov, K.; Rodríguez Quintero, José (Springer Verlag, 2014)
We present a lattice calculation of the renormalized running coupling constant in symmetric (MOM) and asymmetric (^MOM) momentum substraction schemes including u, d, s and c quarks in the sea. An Operator Product Expansion ... -
Transparent expression of the A2 condensate’s renormalization
Boucaud, Ph.; Soto Borrero, Feliciano Carlos de; Le Yaouanc, Alain; Leroy, J. P.; Micheli, J.; Moutarde, Hervé; Pène, O.; Rodríguez Quintero, José (American Physical Society, 2003)
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 ... -
Vacuum expectation value of A2 from LQCD.
Pène, O.; Blossier, Benoit; Boucaud, Ph.; Rodríguez Quintero, José (Sissa Medialab, 2010-12)
We argue from LQCD that there is a non vanishing v.e.v of A μ a Aa μ in QCD in the Landau gauge. We use operator product expansion to provide a clear definition of A μ a Aa μ and extract a number both in the quenched ... -
λQCD from gluon and ghost propagators
De Soto, F.; Gravina, M.; Pène, O.; Rodríguez Quintero, José (Sissa Medialab, 2010-06)
Fundamental quantities of QCD, such as the strong coupling and λQCD, are studied in the framework of lattice QCD with Nf = 2 twisted mass fermions. In particular, the contact between lattice and continuous calculations ...
