  The tensor formulation for the effective theory of QCD vector ressonances,
whose model we denote by TEVR, is given by an antisymmetric tensor field and
describes spin 1 particles. Our goal is to show, by diferent approaches, that
the Abelian version of this model presents the so called "spin jumping" when we
consider its massless limit. Classically we find, by the use of the equations
of motion and the Hamiltonian constraint analysis, that the massive phase of
the model describes spin 1 particles while its massless phase describes spin 0
particles. By the quantum point of view we derive these conclusions via tree
level unitarity analysis and the master action approach.
