PT Journal
AU Athenodorou, A
   Binosi, D
   Boucaud, P
   De Soto, F
   Papavassiliou, J
   Rodriguez-Quintero, J
   Zafeiropoulos, S
TI On the zero crossing of the three-gluon vertex
SO Physics Letters B
JI Phys. Lett. B
PY 2016
BP 444
EP 449
VL 761
DI 10.1016/j.physletb.2016.08.065
LA English
DE Lattice simulations; Three-gluon vertex; Zero crossing; Schwinger-Dyson equations
AB 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 infrared feature known as 'zero crossing', the origin of which is intimately connected with the nonperturbative masslessness of the Faddeev-Popov ghost. The appearance of this effect is clearly visible in one of the two kinematic configurations analyzed, and its theoretical origin is discussed in the framework of Schwinger-Dyson equations. The effective coupling in the momentum subtraction scheme that corresponds to the three-gluon vertex is constructed, revealing the vanishing of the effective interaction at the exact location of the zero crossing.
ER