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It is well known that, in Landau gauge, the renormalization function of theghost-ghost-gluon vertex \widetilde{Z}_1(p^2) is finite and constant, at leastto all orders of perturbation theory. On the other hand, a directnon-perturbative verification of this result using numerical simulations oflattice QCD is still missing. Here we present a preliminary numerical study ofthe ghost-ghost-gluon vertex and of its corresponding renormalization functionusing Monte Carlo simulations in SU(2) lattice Landau gauge. Data were obtainedin 4 dimensions for lattice couplings beta = 2.2, 2.3, 2.4 and lattice sides N= 4, 8, 16.Comment: 3 pages, 1 figure, presented by A. Mihara at the IX Hadron Physics  and VII Relativistic Aspects of Nuclear Physics Workshops, Angra dos Reis,  Rio de Janeiro, Brazil (March 28--April 3, 2004

Numerical Study of the Ghost-Ghost-Gluon Vertex on the Lattice