  We test the renormalization group procedure for effective particles (RGPEP)
on a model of fermion-scalar interaction based on the Yukawa theory. The model
is obtained by truncating the Yukawa theory to just two Fock sectors in the
Dirac front form of Hamiltonian dynamics, a fermion, and a fermion and a boson,
for the purpose of simple analytic calculation that exhibits steps of the
procedure.
