HIGGS-FREE MASSIVE NONABELIAN GAUGE-THEORIES

We analyze nonabelian massive Higgs-free theories in the causal Epstei n-Glaser approach. Recently, there has been renewed interest in these models. In particular we consider the well-known Curci-Ferrari model a nd the nonabelian Stuckelberg models. We explicitly show the reason wh y the considered models fail to be unitary. In our approach only the a symptotic (linear) BRS-symmetry has to be considered.