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Within the framework of Schwinger-Dyson and Bethe-Salpeter equations weinvestigate the importance of pions for the quark-gluon interaction. To thisend we choose a truncation for the quark-gluon vertex that includesintermediate pion degrees of freedom and adjust the interaction such thatunquenched lattice results for various current quark masses are reproduced. Thecorresponding Bethe-Salpeter kernel is constructed from constraints by chiralsymmetry. After extrapolation to the physical point we find a considerablecontribution of the pion back reaction to the quark mass function as well as tothe chiral condensate. The quark wave function is less affected.

Studying pion effects in the quark propagator