Abstract
We present a detailed investigation of the potential of LEP2 to measure the (trilinear) couplings of the vector bosons, Z 0W +W − and γW +W − among one another. The restrictions imposed on non-standard trilinear couplings by symmetry requirements, thus excluding violent boson-loop divergences and a violent growth of tree amplitudes for vector-boson scattering, are discussed in detail. We elaborate on how to extract the W ± spin-density matrix and the W +, W − spin correlations from future data. Various theoretically motivated fits to artificial “data” on e +e −→W +W − are carried out in order to evaluate the potential of LEP2 for the measurement of trilinear vector boson couplings. We stress that a direct measurement of the couplings of the vector bosons with one another is indispensable for a verification of the basic SU(2) L×U(1) Y structure of the present electroweak theory. Such measurements at LEP2 improve indirect LEP1 bounds by factors which occasionally reach a full order of magnitude.
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