Thesis Collection
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Browsing by Subject "QCD"
Now showing items 1-14 of 14
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Concerning pion parton distributions
Cui, Zhu-Fang; Ding, M.; Morgado Chávez, José Manuel; Raya, Khépani; Binosi, Daniele; Chang, L.; Papavassiliou, J.; Roberts, Craig D.; Rodríguez Quintero, José
; Schmidt, S. M. (Springer, 2022-01)
Analyses of the pion valence-quark distribution function (DF), uπ (x; ζ ), which explicitly incorporate the behaviour of the pion wave function prescribed by quantum chromodynamics (QCD), predict uπ (x 1; ζ ) ∼ (1 − ... -
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 ... -
Infrared facets of the three-gluon vertex
Aguilar, A. C.; De Soto, F.; Ferreira, M. N.; Papavassiliou, J.; Rodríguez Quintero, José (Elsevier, 2021-05)
We present novel lattice results for the form factors of the quenched three-gluon vertex of QCD, in two special kinematic configurations that depend on a single momentum scale. We consider three form factors, two associated ... -
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 ... -
Lattice three-gluon vertex in extended kinematics: Planar degeneracy
Pinto Gómez, F.; Soto Borrero, Feliciano Carlos de; Ferreira, M. N.; Papavassiliou, J.; Rodríguez Quintero, José (Elsevier, 2023)
We present novel results for the three-gluon vertex, obtained from an extensive quenched lattice simulation in the Landau gauge. The simulation evaluates the transversely projected vertex, spanned on a special tensorial ... -
Locating the Gribov horizon
Gao, Fei; Qin, Si-Xue; Roberts, Craig D.; Rodríguez Quintero, José (American Physical Society, 2018-02)
We explore whether a tree-level expression for the gluon two-point function, supposed to express effects of an horizon term introduced to eliminate the Gribov ambiguity, is consistent with the propagator obtained in ... -
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 massive gluon propagator, the PT-BFM scheme and the low-momentum behaviour of decoupling and scaling DSE solutions
Rodríguez Quintero, José (Springer Verlag, 2011)
We study the low-momentum behaviour of Yang-Mills propagators obtained from Landau-gauge Dyson-Schwinger equations (DSE) in the PT-BFM scheme. We compare the ghost propagator numerical results with the analytical ones ... -
Preliminary calculation of αs from Green functions with dynamical quarks
Boucaud, Philippe; Leroy, Jean Pierre; Micheli, Jacques; Pène, Olivier; Moutarde, Hervé; Roiesnel, Claude; Rodríguez Quintero, José (2002-01)
We present preliminary results on the computation of the QCD running cou- pling constant in the ^MOM scheme and Landau gauge with two flavours of dynamical Wilson quarks. Gluon momenta range up to about 7GeV (β = 5.6, ... -
Strong Running Coupling from the Gauge Sector of Domain Wall Lattice QCD with Physical Quark Masses
Zafeiropoulos, S.; Boucaud, Ph.; De Soto, F.; Rodríguez Quintero, José; Segovia, Jorge (American Physical Society, 2019-04)
We report on the first computation of the strong running coupling at the physical point (physical pion mass) from the ghost-gluon vertex, computed from lattice simulations with three flavors of domain wall fermions. We ... -
Testing the OPE Wilson coefficient for A2 from lattice QCD with a dynamical charm
Blossier, B.; Boucaud, Ph.; Brinet, M.; Rodríguez Quintero, José (American Physical Society, 2014-05)
Gluon and ghost propagators data, obtained in Landau gauge from lattice simulations with two light and two heavy dynamical quark flavours (Nf=2+1+1), are described here with a running formula including a four-loop ... -
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 ... -
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 ...
