Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-12-19
Phys.Lett. B373 (1996) 141-146
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, Latex with 2 epsf-embedded postscript figures
Scientific paper
10.1016/0370-2693(96)00120-7
A method to embed models of strong $WW$ scattering in unitary gauge amplitudes is presented that eliminates the need for the effective $W$ approximation (EWA) in the computation of cross sections at high energy colliders.The cross sections obtained from the U-gauge amplitudes include the distributions of the final state fermions in $ff \rightarrow ffWW$, which cannot be obtained from the EWA. Since the U-gauge method preserves the interference of the signal and the gauge sector background amplitudes, which is neglected in the EWA, it is more accurate, especially if the latter is comparable to or bigger than the signal, as occurs for instance at small angles because of Coulomb singularities. The method is illustrated for on-shell $W^+W^+ \rightarrow W^+W^+$ scattering and for $qq \rightarrow qqW^+W^+$.
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