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High Energy Physics - Phenomenology

arXiv:1502.00262 (hep-ph)
[Submitted on 1 Feb 2015 (v1), last revised 11 Jun 2015 (this version, v2)]

Title:Higgs and Dark Matter Physics in the Type-II Two-Higgs-Doublet Model inspired by E_6 GUT

Authors:P. Ko (KIAS), Yuji Omura (Nagoya University), Chaehyun Yu (KIAS)
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Abstract:We study Higgs and dark matter physics in the type-II two-Higgs-doublet model (2HDM) with an extra U(1)_H gauge symmetry, inspired by the E_6 grand unified theory (GUT). From the viewpoint of the bottom-up approach, the additional U(1)_H gauge symmetry plays a crucial role in avoiding the tree-level flavor changing neutral currents mediated by neutral Higgs bosons in general 2HDMs. In the model with U(1)_H gauge symmetry, which has Type-II Yukawa couplings, we have to introduce additional chiral fermions that are charged under the U(1)_H gauge symmetry as well as under the Standard-Model (SM) gauge symmetry in order to cancel chiral gauge anomalies. For the U(1)_H charge assignment and the extra matters, we adopt the ones inspired by the E_6 GUT: the extra quark-like and lepton-like fermions with the non-trivial U(1)_H charges. We discuss their contributions to the physical observables, such as the measurements of Higgs physics and electro-weak interactions, and investigate the consistency with the experimental results. Furthermore, we could find extra neutral particles like the SM neutrinos after the electro-weak symmetry breaking, and they could be stable, because of the remnant symmetry after U(1)_H symmetry breaking. We also discuss the thermal relic density and the (in)direct-detections of this dark matter candidate.
Comments: 26 pages, 6 figures, version published in JHEP
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
Report number: KIAS-PREPRINT-P15006
Cite as: arXiv:1502.00262 [hep-ph]
  (or arXiv:1502.00262v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1502.00262
Journal reference: JHEP 1506, 034 (2015)

Submission history

From: Chaehyun Yu [view email]
[v1] Sun, 1 Feb 2015 14:18:03 UTC (417 KB)
[v2] Thu, 11 Jun 2015 03:46:37 UTC (415 KB)
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