Studying pion effects in the quark propagator

Details Studying pion effects in the quark propagator Studying pion effects in the quark propagator

2007-11-05

arxiv.org/abs/0711.0610v1

ECONFC070910:268,2007; Prog.Part.Nucl.Phys.61:81-83,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at 11th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2007), Julich, Ger

Scientific paper

10.1016/j.ppnp.2007.12.045

Within the framework of Schwinger-Dyson and Bethe-Salpeter equations we investigate the importance of pions for the quark-gluon interaction. To this end we choose a truncation for the quark-gluon vertex that includes intermediate pion degrees of freedom and adjust the interaction such that unquenched lattice results for various current quark masses are reproduced. The corresponding Bethe-Salpeter kernel is constructed from constraints by chiral symmetry. After extrapolation to the physical point we find a considerable contribution of the pion back reaction to the quark mass function as well as to the chiral condensate. The quark wave function is less affected.

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