Probing nonstandard bosonic interactions via Wboson pair production at lepton colliders
Abstract
The process e^{+}e^{} → W^{+}W^{} provides a valuable laboratory to test the Standard Model (SM) and to search for new physics. The most general helicity amplitudes for this process require the introduction of nine formfactors which we calculate in the context of SU(2) × U(1) gaugeinvariant extensions of the SM. The contributions of new physics are parameterized via an effective Lagrangian constructed from the light fields. Because the mechanism of electroweak symmetrybreaking remains an open problem we consider both the effective Lagrangian with a linearly realized Higgs sector, i.e. with a light physical Higgs boson, and the effective Lagrangian which utilizes a nonlinear realization of the Higgs mechanism. The use of an effective Lagrangian allows one to calculate consistently nonstandard contributions to e^{+}e^{} → W^{+}W^{} amplitudes as well as the nonstandard contributions to other processes. We study the interplay of the lowenergy and Zpole measurements with measurements via the processes e ^{+}e ^{} → ƒ overlineƒ and e^{+}e^{} → W^{+}W^{} LEP II or a future linear e^{+}e^{} collider. Concrete relationships between operators of the linear and nonlinear realizations are presented where possible.
 Publication:

Nuclear Physics B
 Pub Date:
 February 1997
 DOI:
 10.1016/S05503213(97)002083
 arXiv:
 arXiv:hepph/9612268
 Bibcode:
 1997NuPhB.496...66H
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 \documentstyle[aps,floats,psfig,subeqn,rotate,eqsecnum]{revtex} postscript version also available from ftp://ftp.kek.jp/kek/preprints/TH/TH497