Exploring T and S parameters in Vector Meson Dominance Models of Strong Electroweak Symmetry Breaking
Abstract
We revisit the electroweak precision tests for Higgsless models of strong EWSB. We use the Vector Meson Dominance approach and express S and T via couplings characterizing vector and axial spin-1 resonances of the strong sector. These couplings are constrained by the elastic unitarity and by requiring a good UV behavior of various formfactors. We pay particular attention to the one-loop contribution of resonances to T (beyond the chiral log), and to how it can improve the fit. We also make contact with the recent studies of Conformal Technicolor. We explain why the second Weinberg sum rule never converges in these models, and formulate a condition necessary for preserving the custodial symmetry in the IR.
Keywords
Cite
@article{arxiv.1111.3534,
title = {Exploring T and S parameters in Vector Meson Dominance Models of Strong Electroweak Symmetry Breaking},
author = {Axel Orgogozo and Slava Rychkov},
journal= {arXiv preprint arXiv:1111.3534},
year = {2015}
}
Comments
35 pages, 7 figures; v3: refs added, to appear in JHEP