Natural Alignment in the Two Higgs Doublet Model

Abstract

As the LHC Higgs data persistently suggest the couplings of the observed 125 GeV Higgs boson to be consistent with the Standard Model (SM) expectations, any extended Higgs sector must lead to the so-called SM alignment limit, where one of the Higgs bosons behaves exactly like that of the SM. 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. We present a novel symmetry justification for `natural' alignment without necessarily decoupling or fine-tuning. We show that there exist only three different symmetry realizations of the natural alignment scenario in 2HDM. We identify the 2HDM parameter space satisfying the natural alignment condition up to the Planck scale. We also analyze new collider signals for the heavy Higgs sector in the natural alignment limit, which dominantly lead to third-generation quarks in the final state and can serve as a useful observational tool during the Run-II phase of the LHC.

15 pages, based on a plenary presentation given by A. Pilaftsis at the Fifth Symposium on Prospects in the Physics of Discrete Symmetries (2016, Warsaw, Poland), (significant text overlap with arXiv:1408.3405, arXiv:1503.09140 and arXiv:1510.08790)

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Cited by in corpus (13)

• Maximally Symmetric Three Higgs Doublet Model
• Quartic Coupling Unification in the Maximally Symmetric 2HDM
• CP violation effects in the diphoton spectrum of heavy scalars
• P-even, CP-violating Signals in Scalar-Mediated Processes
• High Scale Boundary Conditions in Models with Two Higgs Doublets
• Consequences of Minimal Entanglement in Bosonic Field Theories
• Exceptional regions of the 2HDM parameter space
• Dynamical Higgs Field Alignment in the NMSSM
• Signature of the Maximally Symmetric 2HDM via $W^{\pm }/Z$-Quadruplet Productions at the LHC
• Charged Higgs decay to $W^{\pm }H$ at a high energy lepton collider
• Heavy neutral 2HDM Higgs Boson Pair Production at CLIC Energies
• Fine-Tuning in the 2HDM
• Observability of 2HDM charged Higgs boson in a misaligned scenario