Towards a Complete Calculation of $\gamma \gamma \to 4f$

Abstract

We propose a general classification of all four fermion final states in $\gamma \gamma$ collisions at a future $e^{+}{e}^{-}$ Linear Collider and discuss the relation of ``signal'' and ``background'' contributions in vector boson production. We utilize the results in a critical examination of the Higgs signal in sub-threshold $W^{+}{W}^{-}$ pair production.

Comments: 13 pages, LaTeX (using amsmath.sty), preformatted version available as ftp://crunch.ikp.physik.th-darmstadt.de/pub/preprints/IKDA-97-16.ps.gz