Publication: Strongly interacting electroweak symmetry breaking sector with a Higgs-like light scalar
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2014
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American Institute of Physics
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Abstract
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.
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© 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).
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