
pmid: 10014961
We map the parameter space that leads to stable [ital Z] vortices in the electroweak model. For sin[sup 2][theta][sub [ital W]]=0.23, we find that the strings are unstable for a Higgs-boson mass larger than 24 GeV. Given the latest constraints on the Higgs-boson mass from the CERN [ital e][sup +][ital e[minus]] collider LEP, this shows that, if the standard electroweak model is realized in nature, the [ital Z] vortex (in the bare model) is unstable.
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