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In this work, we report about the determination of nonperturbative OPEparameters from fits of continuum perturbation theory to the Landau gauge quarkpropagator. The propagators are computed numerically using lattice QCD withNf=2 dynamical Wilson twisted mass fermions. We use four different values ofthe lattice spacing ranging from about 0.1 fm to about 0.05 fm as well asseveral quark masses per lattice spacing. This allows us to obtain continuumresults for the chiral condensate and the average up/down quark mass. The mainresults are the average up/down quark mass m_q = 3.0(4)(2) MeV at the physicalpoint and a value of the chiral condensate of -(299(26)(29) MeV)^3 in thechiral limit, both in the MSbar scheme at 2 GeV. We have also studiednonperturbative contaminations of our results at small values of the momenta,which are often interpreted as the contribution of the gluon condensate A^2. Wedo see contributions from such terms, which are, however, not stable over theorder in perturbation theory.

Quark mass and chiral condensate from the Wilson twisted mass lattice quark propagator