$\Lambda_{QCD}$ from gluon and ghost propagators

F. De soto; M. Gravina; O. Pène; J. Rodríguez-Quintero

$\Lambda_{QCD}$ from gluon and ghost propagators

High Energy Physics - Lattice 2010-11-05 v1

Authors: F. De soto , M. Gravina , O. Pène , J. Rodríguez-Quintero

Abstract

Fundamental quantities of QCD, such as the strong coupling and $\Lambda_{QCD}$ , are studied in the framework of lattice QCD with $N_f=2$ twisted mass fermions. In particular, the contact between lattice and continuous calculations is made by comparing the renormalized ghost-gluon vertex in MOM scheme with 4-loop perturbative results. A power correction is needed in order to have agreement between the two descriptions. This suggests the presence of a dimension-two $\VEV{A^2}$ gluon condensate whose value is found to be higher than in the quanched case.

Keywords

quantum chromodynamics lattice qcd landau gauge gluon propagator

Cite

@article{arxiv.0911.4505,
  title  = {$\Lambda_{QCD}$ from gluon and ghost propagators},
  author = {F. De soto and M. Gravina and O. Pène and J. Rodríguez-Quintero},
  journal= {arXiv preprint arXiv:0911.4505},
  year   = {2010}
}

Comments

8 pages. Presented at the XXVII International Symposium on Lattice Field Theory, July 26-31, 2009, Peking University, Beijing, China

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