PT Journal
AU Aguilar, AC
   Ibañez, D
   Papavassiliou, J
TI Ghost propagator and ghost-gluon vertex from Schwinger-Dyson equations
SO Physical Review D
JI Phys. Rev. D
PY 2013
BP 114020
EP 14pp
VL 87
IS 11
DI 10.1103/PhysRevD.87.114020
LA English
AB We study an approximate version of the Schwinger-Dyson equation that controls the nonperturbative behavior of the ghost-gluon vertex in the Landau gauge. In particular, we focus on the form factor that enters in the dynamical equation for the ghost dressing function, in the same gauge, and derive its integral equation, in the "one-loop dressed" approximation. We consider two special kinematic configurations, which simplify the momentum dependence of the unknown quantity; in particular, we study the soft gluon case and the well-known Taylor limit. When coupled with the Schwinger-Dyson equation of the ghost dressing function, the contribution of this form factor provides considerable support to the relevant integral kernel. As a consequence, the solution of this coupled system of integral equations furnishes a ghost dressing function that reproduces the standard lattice results rather accurately, without the need to artificially increase the value of the gauge coupling.
ER