  We propose a multiloop generalization of the Bern-Kosower formalism, based on
Strassler's approach of evaluating worldline path integrals by worldline Green
functions. Those Green functions are explicitly constructed for the basic
two-loop graph, and for a loop with an arbitrary number of propagator
insertions. For scalar and abelian gauge theories, the resulting integral
representations allow to combine whole classes of Feynman diagrams into compact
expressions.

High Energy Physics - Theory;High Energy Physics - Phenomenology