2026-06-26T09:54:06Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/337752025-09-05T17:18:28Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Dobado González, Antonio
author
Delgado López, Rafael
author
Llanes Estrada, Felipe José
2023-06-19T13:27:50Z
2023-06-19T13:27:50Z
2014
0094-243X
10.1063/1.4891127
https://hdl.handle.net/20.500.14352/33775
http://dx.doi.org/10.1063/1.4891127
http://scitation.aip.org/
The apparent finding of a 125-GeV light Higgs boson closes unitarity of the minimal Standard Model (SM), that is weakly interacting: this is an exceptional feature not generally true if new physics exists beyond the mass gap found at the LHC up to 700 GeV. Such new physics induces departures of the low-energy dynamics for the minimal electroweak symmetry-breaking sector, with three Goldstone bosons (related to longitudinal W bosons) and one light scalar, from the SM couplings. We calculate the scattering amplitudes among these four particles and their partial-wave projections in effective theory. For this we employ the Electroweak Chiral Lagrangian extended by one light scalar and carry out the complete one-loop computation at high energy including the counterterms needed for perturbative renormalization, of dimension eight. For most of parameter space, the scattering is strongly interacting (with the SM a remarkable exception). We therefore explore various unitarization methods, that can already be applied to the tree-level W_LW_L amplitude; we find and study a natural second sigma-like scalar pole there.
eng
Strongly interacting electroweak symmetry breaking sector with a Higgs-like light scalar
journal article
URL
https://docta.ucm.es/bitstreams/b57fde65-8a45-4f6f-bf34-0745ca62ea8f/download
File
MD5
6d28b209c9c78159c19a5c6927d8d847
915351
application/pdf
LlanesEstrada 86libre.pdf