A Universal Lagrangian for Massive Yang-Mills Theories without Higgs Bosons

A universal Lagrangian that defines various four-dimensional massive Yang-Mills theories without Higgs bosons is presented. Each of the theories is characterized by a constant k contained in the Lagrangian. For k=0, the Lagrangian reduces to one defining the topologically massive Yang-Mills theory, and for k=1, the Lagrangian reduces to one defining the Freedman-Townsend model. New massive Yang-Mills theories are obtained by choosing k to be real numbers other than 0 and 1.