Constraining the strongly coupled standard model including a W' isotriplet.

We consider the Strongly-Coupled Standard Model (Abbott-Farhi model) including an isotriplet of W ′ vector bosons. First we calculate the corrections to the low-energy theory, which can be effectively summarized in terms of the parameters S, T and U. Then we use high-precision electroweak measurements to constrain the mass and couplings of the W ′. The W ′ couplings are restricted to be unnaturally small, and we conclude that this model is no longer compelling as a theory of the electroweak interactions. This work is supported in part by the U.S. Department of Energy under contract DE-AC03-76SF00515. This work is supported in part by the U.S. Department of Energy under contract DE-AC02-76ER03069. This work is supported in part by the National Science Foundation under Grant No. PHY89-04035.