Quark mass effects on the topological susceptibility in QCD - art. no. 054502

We investigate topology in lattice simulations of QCD with two flavors of d ynamical Wilson fermions. At various sea quark masses we find reasonable ag reement between results for the topological charge from fermionic and gluon ic definitions, the latter with cooling. We study correlations of the topol ogical charge with light hadronic observables and find effects in the flavo r singlet pseudoscalar channel. The quark mass dependence of the topologica l susceptibility chi is consistent with the leading order small m(pi) expec tation, chi = f(pi)(2)m(pi)(2)/4.