Natural Standard Model Alignment in the Two Higgs Doublet Model

Abstract

The current LHC Higgs data provide strong constraints on possible deviations of the couplings of the observed 125 GeV Higgs boson from the Standard Model (SM) expectations. Therefore, it now becomes compelling that any extended Higgs sector must comply with the so-called SM alignment limit. In the context of the Two Higgs Doublet Model (2HDM), this alignment is often associated with either decoupling of the heavy Higgs sector or accidental cancellations in the 2HDM potential. Here we present a new solution realizing natural alignment based on symmetries, without decoupling or fine-tuning. In particular, we show that in 2HDMs where both Higgs doublets acquire vacuum expectation values, there exist only three different symmetry realizations leading to natural alignment. We discuss some phenomenological implications of the Maximally-Symmetric 2HDM based on SO(5) symmetry group and analyze new collider signals for the heavy Higgs sector, involving third-generation quarks, which can be a useful observational tool during the Run-II phase of the LHC.

15 pages, 1 table, 8 figures; Contribution to the Proceedings of DISCRETE 2014, London

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• Self-consistent Dark Matter Simplified Models with an s-channel scalar mediator
• Closing the Wedge: Search Strategies for Extended Higgs Sectors with Heavy Flavor Final States
• Muon $g-2$ in the Aligned Two Higgs Doublet Model
• The NMSSM is within Reach of the LHC: Mass Correlations & Decay Signatures
• Natural Stabilization of the Higgs Boson's Mass and Alignment
• CP violation effects in the diphoton spectrum of heavy scalars
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• Resurrecting the LHC discovery potential in the extended Type-II Seesaw Model
• Multi-Higgs models. Perspectives for identification of wide set of models in future experiments at colliders in the SM-like situation