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Area of Science:

  • Particle Physics
  • High Energy Physics
  • Standard Model Extensions

Background:

  • The Standard Model (SM) includes a Higgs sector, but extensions like the two-Higgs-doublet model (2HDM) are theoretically motivated.
  • The type-I 2HDM, with a Z_{2} symmetry, allows for multiple light Higgs states.
  • Current experimental data from Higgs boson searches and B-physics do not exclude these light Higgs states.

Purpose of the Study:

  • To investigate the observability of new Higgs states in the type-I 2HDM.
  • To determine if these Higgs states can be simultaneously detected in multi-b final states.
  • To assess the potential of the high-luminosity Large Hadron Collider (HL-LHC) in discovering these states.

Main Methods:

  • Analysis of the type-I Z_{2}-symmetric 2HDM with light Higgs states (O(100) GeV).
  • Focus on electroweak (EW) production of Higgs pairs.
  • Examination of multi-b final state signatures.

Main Results:

  • All five new physical Higgs states in the type-I 2HDM can be simultaneously observable.
  • Signatures for these Higgs states can exceed 5σ statistical significance at the 13 TeV HL-LHC.
  • These findings are achievable in parameter space regions excluded by other 2HDM types.

Conclusions:

  • Experimental validation of these multi-b signatures would strongly support the type-I 2HDM.
  • This study highlights a unique discovery channel for extended Higgs sectors.
  • The type-I 2HDM offers a viable and testable scenario beyond the Standard Model.