Explaining the Higgs decays at the LHC with an extended electroweak model

• Published in: The European physical journal. C, Particles and fields Vol. 73; no. 2; pp. 1 - 9
• Main Authors: Alves, Alexandre, Ramirez Barreto, E., Dias, A. G., de S. Pires, C. A., Queiroz, Farinaldo S., Rodrigues da Silva, P. S.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.02.2013; Springer Nature B.V; Springer
• Subjects: Astronomy; Astrophysics and Cosmology; Bosons; Channels; Decay; Economics; Electroweak model; Elementary Particles; Hadrons; Heavy Ions; Higgs bosons; Large Hadron Collider; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Quantum Field Theories; Quantum Field Theory; Regular Article - Theoretical Physics; String Theory; Tuning; Gauge Boson; Vector Boson; Large Hadron Collider; Minimal Supersymmetric Standard Model; Higgs Boson
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-013-2288-y

We show that the observed enhancement in the diphoton decays of the recently discovered new boson at the LHC, which we assume to be a Higgs boson, can be naturally explained by a new doublet of charged vector bosons from extended electroweak models with SU(3) C ⊗SU(3) L ⊗U(1) X symmetry. These models are also rather economical in explaining the measured signal strengths, within the current experimental errors, demanding fewer assumptions and less parameters tuning. Our results show a good agreement between the theoretical expected sensitivity to a 126–125 GeV Higgs boson, and the experimental significance observed in the diphoton channel at the 8 TeV LHC. Effects of an invisible decay channel for the Higgs boson are also taken into account, in order to anticipate a possible confirmation of deficits in the branching ratios into ZZ ∗ , WW ∗ , bottom quarks, and tau leptons.