One-loop effects from spin-1 resonances in Composite Higgs models
Abstract
We compute the 1-loop correction to the electroweak observables from spin-1 resonances in SO(5)/SO(4) composite Higgs models. The strong dynamics is modeled with an effective description comprising the Nambu-Goldstone bosons and the lowest-lying spin-1 resonances. A classification is performed of the relevant operators including custodially-breaking effects from the gauging of hypercharge. The 1-loop contribution of the resonances is extracted in a diagrammatic approach by matching to the low-energy theory of Nambu-Goldstone bosons. We find that the correction is numerically important in a significant fraction of the parameter space and tends to weaken the bounds providing a negative shift to the S parameter.
Cite
@article{arxiv.1504.02750,
title = {One-loop effects from spin-1 resonances in Composite Higgs models},
author = {Roberto Contino and Matteo Salvarezza},
journal= {arXiv preprint arXiv:1504.02750},
year = {2015}
}
Comments
45 pages, 13 figures. v2: minor corrections, conclusions unchanged. v3: two diagrams in Fig.13 correctly redrawn