  The topological susceptibility and the higher moments of the topological
charge distribution in QCD are expressed through certain n-point functions of
the scalar and pseudo-scalar quark densities at vanishing momenta, which are
free of short-distance singularities. Since the normalization of the
correlation functions is determined by the non-singlet chiral Ward identities,
these formulae provide an unambiguous regularization-independent definition of
the moments and thus of the charge distribution.
