Bremsstrahlung approximation for inclusive processes

In the framework of the quantum-field model zetasup(int) = -ig psi * dsub(μ) psi Asup(μ) there has been considered the inclusive reaction a+b → c+..., where a, b are scalar ''nucleons'' psi, c is a detected meson A. Using the bremsstrahlung approximation the cross section of this reaction has been found in the bremsstrahlung production of secondaries cannot pretend to describe the inclusive processes in the central region (x approximately 0)