Semi-leptonic four-fermion final states in polarised γγ reactions: Exact results vs an improved narrow width approximation
Abstract
We calculate the process γ γ → e- e u d with the full set of Feynman diagrams. We consider different implementations of the W width and different combinations of the photon polarisations. The results of an improved narrow width approximation based on γ γ → W+ W- with full spin-correlations that takes into account different angular cuts as well as cuts on the invariant masses are compared to those of the complete calculation.
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