2HDM neutral scalars under the LHC

Felix Kling (SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, U.S.A.) ; Shufang Su (Department of Physics, University of Arizona, Tucson, AZ, 85721, U.S.A.) ; Wei Su (ARC Centre of Excellence for Particle Physics at the Terascale, Department of Physics, University of Adelaide, Adelaide, South Australia, 5005, Australia)

Two Higgs Doublet Models (2HDM) provide a simple framework for new physics models with an extended Higgs sector. The current LHC results, including both direct searches for additional non-Standard Model (SM) Higgs bosons, as well as precision measurements of the SM-like Higgs couplings, already provide strong constraints on the 2HDM parameter spaces. In this paper, we examine those constraints for the neutral scalars in the Type-I and Type-II 2HDM. In addition to the direct search channels with SM final states: H/A → f f ¯ $$ f\overline{f} $$ , VV, Vh, hh, we study in particular the exotic decay channels of H/A → AZ/HZ once there is a mass hierarchy between the non-SM Higgses. We found that H/A → AZ/H Z channel has unique sensitivity to the alignment limit region which remains unconstrained by conventional searches and Higgs precision measurements. This mode also extends the reach at intermediate t β for heavy m A that are not covered by the other direct searches.

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  "abstracts": [
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      "source": "Springer", 
      "value": "Two Higgs Doublet Models (2HDM) provide a simple framework for new physics models with an extended Higgs sector. The current LHC results, including both direct searches for additional non-Standard Model (SM) Higgs bosons, as well as precision measurements of the SM-like Higgs couplings, already provide strong constraints on the 2HDM parameter spaces. In this paper, we examine those constraints for the neutral scalars in the Type-I and Type-II 2HDM. In addition to the direct search channels with SM final states: H/A \u2192   <math> <mi>f</mi> <mover> <mi>f</mi> <mo>\u00af</mo> </mover> </math>  $$ f\\overline{f} $$  , VV, Vh, hh, we study in particular the exotic decay channels of H/A \u2192 AZ/HZ once there is a mass hierarchy between the non-SM Higgses. We found that H/A \u2192 AZ/H Z channel has unique sensitivity to the alignment limit region which remains unconstrained by conventional searches and Higgs precision measurements. This mode also extends the reach at intermediate t  \u03b2  for heavy m  A  that are not covered by the other direct searches."
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Published on:
26 June 2020
Publisher:
Springer
Published in:
Journal of High Energy Physics , Volume 2020 (2020)
Issue 6
Pages 1-23
DOI:
https://doi.org/10.1007/JHEP06(2020)163
arXiv:
2004.04172
Copyrights:
The Author(s)
Licence:
CC-BY-3.0

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