Abstract
Studies a model based on N scalar complex fields coupled to a scalar real field, where all fields are treated classically as c-numbers. The model describes a composite particle made up of n constituents with bare mass m0 interacting both with each other and with themselves via the exchange of a particle of mass mu 0. The stationary states of the composite particle are described by relativistic Hartree equations. Since the self-interactions is included, the case of an elementary particle is a non-trivial special case of this model. Using an integral transform method, the author derives the exact ground-state solution and prove its local stability. The mass of the composite particle is calculated as the total energy in the rest frame. For the case of a massless exchange particle the mass formula is given in closed form. The mass, as a function of the coupling constant, possesses a well pronounced minimum for each value of mu 0/m0, while the absolute minimum occurs at mu 0=0.
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