Semi-leptonic four-fermion final states in polarised γγ reactions: Exact results vs an improved narrow width approximation

Details Semi-leptonic four-fermion final states in polarised γγ reactions: Exact results vs an improved narrow width approximation Semi-leptonic four-fermion final states in polarised γγ reactions: Exact results vs an improved narrow width approximation

1997-01-24

arxiv.org/abs/hep-ph/9701368v1

Phys.Lett. B404 (1997) 124-136

Physics

High Energy Physics

High Energy Physics - Phenomenology

paper in LATEX, 19 pages, 3 figures. Complete psfile available via anonymous ftp at ftp://lapphp0.in2p3.fr/pub/preprints-theor

Scientific paper

10.1016/S0370-2693(97)00496-6

We calculate the process $\gamma \gamma \rightarrow e^- \bar{\nu}_e u \bar{d}$ 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 $\gamma \gamma \rightarrow W^+ W^-$ 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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