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# Unitarity in composite Higgs approaches with vector resonances

Barducci, D., Cai, H., De Curtis, S., Llanes-Estrada, F. J. and Moretti, S. (2015) Unitarity in composite Higgs approaches with vector resonances. Physical Review D, 91, [095013].

Record type: Article

## Abstract

We examine a simple Composite Higgs Model (CHM) with vector resonances in addition to the Standard Model (SM) fields in perturbation theory by using the $K$-matrix method to implement unitarity constraints. We find that the $W_LW_L$ scattering amplitude has an additional scalar pole (analogous to the $\sigma$ meson of QCD) as in generic strongly interacting extensions of the SM. The mass and width of this dynamically generated scalar resonance are large and the mass behaves contrary to the vector one, so that when the vector resonance is lighter, the scalar one is heavier, and vice versa. We also attempt an interpretation of this new resonance. Altogether, the presence of the vector state with the symmetries of the CHM improve the low-energy unitarity behavior also in the scalar-isoscalar channel.

Published date: 18 May 2015
Additional Information: 16 pages, 14 figures
Keywords: hep-ph
Organisations: Theory Group, Physics & Astronomy

## Identifiers

Local EPrints ID: 411840
URI: http://eprints.soton.ac.uk/id/eprint/411840
ISSN: 2470-0010
PURE UUID: 568852ee-e638-443e-acc7-9a02c3c97429

## Catalogue record

Date deposited: 27 Jun 2017 16:31

## Contributors

Author: D. Barducci
Author: H. Cai
Author: S. De Curtis
Author: S. Moretti