O. Nachtmann - A. Rauscher
Institut für Theoretische Physik,
69120 Heidelberg, Germany
Received: 8 March 2000 / Published online: 6 July 2000
© Springer-Verlag 2000
Dedicated to Prof. Franz Wegner on the Occasion of his 60th Birthday
The single-particle inclusive differential cross-section for a reaction is written as the imaginary part of a correlation function in a forward scattering amplitude for in a modified effective theory. In this modified theory the interaction Hamiltonian equals HI in the original theory up to a certain time. Then there is a sign change and becomes nonlocal. This is worked out in detail for scalar field models and for QED plus the abelian gluon model. A suitable path integral for direct calculations of inclusive cross sections is presented.
Copyright Società Italiana di Fisica, Springer-Verlag 2000