RT Journal Article
T1 Strongly interacting electroweak symmetry breaking sector with a Higgs-like light scalar
A1 Dobado González, Antonio
A1 Delgado López, Rafael
A1 Llanes Estrada, Felipe José
AB 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.
PB American Institute of Physics
SN 0094-243X
YR 2014
FD 2014
LK https://hdl.handle.net/20.500.14352/33775
UL https://hdl.handle.net/20.500.14352/33775
LA eng
NO © 2014 AIP Publishing LLC. Russian-Spanish Congress on Particle and Nuclear Physics at all Scales, Astroparticle Physics and Cosmology (2º. 2013. San Petersburgo). AD thanks useful conversations with D. Espriu, M. J. Herrero and J. J. Sanz-Cillero and the organizers of the second Russian-Spanish Congress for their warm hospitality at Saint Petersburg. This work has been supported by the spanish grant FPA2011-27853-C02-01 and by the grant BES-2012-056054 (RLD).
NO Ministerio de Economía y Competitividad (MINECO), España
NO Ministerio de Ciencia e Innovación (MICINN), España
DS Docta Complutense
RD 17 abr 2025