These path integrals have a physical interpretation. The action A describes the orbit of a particle in a space dependent random potential η η ( R → → ) . The path integral over R → → ( ν ν ) yields the end to end distribution of the fluctuating polymer in this potential. The second path integral over η η ( R → → ) with the weight e − − A [ η η ] accounts for the repulsive cloud of other chain elements. To avoid divergence, the η η ( R → → ) integration has to run along the imaginary field axis.