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Unitarity in composite Higgs approaches with vector resonances

Unitarity in composite Higgs approaches with vector resonances
Unitarity in composite Higgs approaches with vector resonances
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.
hep-ph
2470-0010
Barducci, D.
d0289bdd-ac34-493c-95cd-36d811070ecc
Cai, H.
b50ecca5-ee0a-4778-94b6-598959608574
De Curtis, S.
7bf1f7cf-535f-4551-8d05-806c57cfa2d1
Llanes-Estrada, F. J.
f993624a-8951-473e-9a4d-0a8d6c02a6a1
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Barducci, D.
d0289bdd-ac34-493c-95cd-36d811070ecc
Cai, H.
b50ecca5-ee0a-4778-94b6-598959608574
De Curtis, S.
7bf1f7cf-535f-4551-8d05-806c57cfa2d1
Llanes-Estrada, F. J.
f993624a-8951-473e-9a4d-0a8d6c02a6a1
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614

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. (doi:10.1103/PhysRevD.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.

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More information

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

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Date deposited: 27 Jun 2017 16:31
Last modified: 13 Mar 2019 19:43

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