V,W and X in Technicolour Models

Abstract

Light techni-fermions and pseudo Goldstone bosons that contribute to the electroweak radiative correction parameters V,W and X may relax the constraints on technicolour models from the experimental values of the parameters S and T. Order of magnitude estimates of the contributions to V,W and X from light techni-leptons are made when the the techni-neutrino has a small Dirac mass or a large Majorana mass. The contributions to V,W and X from pseudo Goldstone bosons are calculated in a gauged chiral Lagrangian. Estimates of V,W and X in one family technicolour models suggest that the upper bounds on S and T should be relaxed by between 0.1 and 1 depending upon the precise particle spectrum.

19 pages + 2 pages of ps figs, SWAT/16

References in corpus (1)

• Low Scale Technicolour at LEP

Cited by in corpus (5)

• Additional Fermion Families and Precision Electroweak Data
• Negative s and Light New Physics
• Constraints on Masses of Charged PGBs in Technicolor Model from Decay $b\to s\gamma$
• Can light Goldstone boson loops counter the `S-argument' against Technicolor?
• Fermion Mass Postdictions in a Generalized Extended Technicolour Scenario