Abstract
The single-particle inclusive differential cross-section for a reaction a + b → c + X is written as imaginary part of a correlation function in a forward scattering amplitude for a + b → a + b in a modified effective theory. In this modified theory the interaction Hamiltonian H I equals H I of the original theory up to a certain time. Then there is a sign change and H I 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.
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