Studying pion effects in the quark propagator
Abstract
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.
Cite
@article{arxiv.0711.0610,
title = {Studying pion effects in the quark propagator},
author = {Dominik Nickel and Christian S. Fischer and Jochen Wambach},
journal= {arXiv preprint arXiv:0711.0610},
year = {2008}
}
Comments
Talk given at 11th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2007), Julich, Germany, 10-14 Sep 2007