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We consider a model of quantum field theory with higher derivatives for aspinor field with quartic selfinteraction. With the help of the Bethe-Salpeterequation we study the problem of the two particle bound states in the "chain"approximation. The existence of a scalar bound state is established.Comment: 14 pages, no figures, LaTe

ON THE BOUND STATES IN A NONLINEAR QUANTUM FIELD THEORY OF A SPINOR FIELD WITH HIGHER DERIVATIVES