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An enhanced binding of $N$-{\it relativistic} particles coupled to a masslessscalar bose field is investigated. It is not assumed that the system has aground state for the zero-coupling. It is shown, however, that there exists aground state for sufficiently large coupling. The proof is based on checkingthe stability condition and showing a uniform exponential decay of infraredregularized ground states.

Enhanced binding of an N-particle system interacting with a scalar field II.Relativistic version