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Electroweak baryogenesis with anomalous Higgs couplings

Journal of High Energy Physics volume 2016, Article number: 11 (2016) Cite this article

A preprint version of the article is available at arXiv.

Abstract

We investigate feasibility of efficient baryogenesis at the electroweak scale within the effective field theory framework based on a non-linear realisation of the electroweak gauge symmetry. In this framework the LHC Higgs boson is described by a singlet scalar field, which, therefore, admits new interactions. Assuming that Higgs couplings with the eletroweak gauge bosons are as in the Standard Model, we demonstrate that the Higgs cubic coupling and the CP-violating Higgs-top quark anomalous couplings alone may drive the a strongly first-order phase transition. The distinguished feature of this transition is that the anomalous Higgs vacuum expectation value is generally non-zero in both phases. We identify a range of anomalous couplings, consistent with current experimental data, where sphaleron rates are sufficiently fast in the ‘symmetric’ phase and are suppressed in the ‘broken’ phase and demonstrate that the desired baryon asymmetry can indeed be generated in this framework. This range of the Higgs anomalous couplings can be further constrained from the LHC Run 2 data and be probed at high luminosity LHC and beyond.

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  1. ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, The University of Sydney, Sydney, NSW, 2006, Australia

    Archil Kobakhidze, Lei Wu & Jason Yue

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  1. Archil Kobakhidze
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Correspondence to Archil Kobakhidze.

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Kobakhidze, A., Wu, L. & Yue, J. Electroweak baryogenesis with anomalous Higgs couplings. J. High Energ. Phys. 2016, 11 (2016). https://doi.org/10.1007/JHEP04(2016)011

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Keywords

  • Cosmology of Theories beyond the SM
  • Higgs Physics