  An effective field theory describing the QCD diffraction scattering is
constructed. The constituent quarks interacting with multiperi- pheral gluons
and Goldstone bosons are described by impact- parameter two-dimensional sigma
models for the color and the flavor degrees of freedom. The elastic scattering
amplitude is then shown to factorize into the hard and the soft pomeron
contributions (talk at 5th Blois Workshop on Elastic and Diffractive Scattering
Workshop, June 8 - 12, 1993, Providence RI USA)
