Trilinear couplings among the electroweak vector bosons and their determination at LEP-200
Feb, 1993
68 pages
Published in:
- Nucl.Phys.B 409 (1993) 22-68
Report number:
- BI-TP-92-44,
- PM-92-43
Citations per year
Abstract: (Elsevier)
We present a detailed investigation of the potential of LEP2 to measure the (trilinear) couplings of the vector bosons, Z 0 W + 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.- electron positron: annihilation
- annihilation: electron positron
- W: pair production
- pair production: W
- coupling: (Z0 W+ W-)
- (Z0 W+ W-): coupling
- coupling: (W+ W- photon)
- (W+ W- photon): coupling
- electroweak interaction: validity test
- validity test: electroweak interaction
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