Framework for composite vector bosons: The stable-particle case

We propose a framework to investigate the internal structure of vector bosons like the Z0, assuming that they are composed of elementary constituents, e.g., a preon-antipreon pair. Depending on how the constituents of a vector boson interact with the external particles, the functions which characterize the composite nature of the vector boson have different kinematic dependence. We present a formulation of the propagator of a composite vector boson which is assumed to be stable under the preon interactions. Phenomenological implications are briefly discussed