We present results of a hybrid Monte-Carlo algorithm for dynamical, nf=2, four-dimensional QCD with overlap fermions. The fermionic force requires careful treatment, when changing topological sectors. The pion mass dependence of the topological susceptibility is studied on 64 and 12⋅63 lattices. The results are transformed into physical units.
@article{arxiv.hep-lat/0409070,
title = {Dynamical overlap fermions, results with HMC algorithm},
author = {Z. Fodor and S. D. Katz and K. K. Szabo},
journal= {arXiv preprint arXiv:hep-lat/0409070},
year = {2009}
}