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Renormalization group procedure for effective particles: elementary example of exact solution with finite mass corrections and no involvement of vacuum

Renormalization group procedure for effective particles in the front form of Hamiltonian dynamics is applied to an elementary quantum field theory for two species of particles mixed through a mass-like interaction term. The model interaction generates only finite terms and the procedure yields a whole family of equivalent effective theories. The exact solution for the family is found without involvement of the vacuum state in the dynamics. Physical spectrum is obtained at the end of the procedure in the form of free particles with definite masses. Since the procedure is designed in general terms, it could be used for the purpose of constructing effective dynamics also in other theories than the elementary model.

preprint2012arXivOpen access

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