Topological Susceptibility and Zero Mode Size in Lattice QCD
  We use the overlap formalism to define a topological index on the lattice. We study the spectral flow of the hermitian Wilson-Dirac operator and identify zero crossings with topological objects. We determine the topological susceptibility and zero mode size distribution, and we comment on the stability of our results. 
Robert G. Edwards, Urs M. Heller and Rajamani Narayanan