Spontaneous chiral symmetry breaking in particle physics

The effective potential for anti qq condensation is examined also taking account of contributions from the non-perturbative region. An electronic computer is used to solve the nonlinear differential equation. We reach the conclusions that contributions from the non-perturbative region play an important role in explaining spontaneous chiral symmetry breaking quantitatively, and that effective coupling should be strong to some extent in the non-perturbative region. (orig.)