On the Phase Diagram of Massive Yang-Mills
  The phases of a lattice gauge model for the massive Yang-Mills are investigated. The phase diagram supports the recent conjecture on the large energy behavior of nonlinearly realized massive gauge theories (i.e. mass a` la Stueckelberg, no Higgs mechanism), envisaging a Phase Transition (PT) to an asymptotically free massless Yang-Mills theory. 
Ruggero Ferrari
hep-lat hep-ph hep-th