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

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Abstract

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.

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Notes

  1. We take here the condition on the scalar fields self-couplings λ 1=λ 2 in the appendix of Ref. [7]. Such a simplification also leads to a maximal mixing between h=h 1 and another scalar h 2 which, naturally, could be heavier than h.

  2. This particle can be made stable by imposing a symmetry that transforms only the 341 fields which are singlet under the 331 symmetry. It is in this sense that we call it a typical 341 particle.

  3. In 341 models, the expected signal rate for the process pp→h→γγ is the same as the minimal 331. The SUSY331 gives additional contributions both to the Higgs boson production in gluon fusion, as the Higgs decay to photons. However, for a heavy SUSY spectrum the extra states would have a small impact on σ×BR(h→γγ).

  4. See Ref. [22] for a good compilation of the relevant experimental data.

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Acknowledgements

This work was supported by Conselho Nacional de Pesquisa e Desenvolvimento Científico—CNPq, Coordenação de Aperfeiçoamento Pessoal de Nível Superior—CAPES, and Fundação de Amparo à Pesquisa do Estado de São Paulo—FAPESP.

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Authors and Affiliations

  1. Departamento de Ciências Exatas e da Terra, Universidade Federal de São Paulo, Diadema, SP, 09972-270, Brazil

    Alexandre Alves

  2. Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, SP, 09210-170, Brazil

    E. Ramirez Barreto & A. G. Dias

  3. Departamento de Física, Universidade Federal da Paraíba, Caixa Postal 5008, João Pessoa, PB, 58051-970, Brazil

    C. A. de S. Pires, Farinaldo S. Queiroz & P. S. Rodrigues da Silva

  4. Center for Particle Astrophysics, Fermi National Accelerator Laboratory, Batavia, IL, 60510, USA

    Farinaldo S. Queiroz

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  1. Alexandre Alves
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Correspondence to E. Ramirez Barreto.

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Alves, A., Ramirez Barreto, E., Dias, A.G. et al. Explaining the Higgs decays at the LHC with an extended electroweak model. Eur. Phys. J. C 73, 2288 (2013). https://doi.org/10.1140/epjc/s10052-013-2288-y

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