QCD sum rule analysis for light vector and axial-vector mesons in vacuum and nuclear matter - art. no. 015202

Extending previous work we study the constraints of QCD sum rules on mass a nd width of light vector and axial-vector mesons in vacuum and in a medium with finite nuclear density. For the latter case especially the effect of n uclear pions leading to vector-axial-vector mixing is included in the analy sis. We examine the consequences of the mixing effect for positions and sha pes of the peaks which show up in the current-current correlators. We also discuss the model dependences in the amount of mixing, in the evaluation of the four-quark condensate, and in the width parametrizations for the meson spectral functions.