Maximally symmetric two Higgs doublet model with natural standard model alignment

By P. S. Bhupal Dev, A. Pilaftsis. 2014

174 citations recorded by the source corpus.

A bstractWe study the Higgs mass spectrum as predicted by a Maximally Symmetric Two Higgs Doublet Model (MS-2HDM) potential based on the SO(5) group, softly broken by bilinear Higgs mass terms. We show that the lightest Higgs sector resulting from this MS-2HDM becomes naturally aligned with that of the Standard Model (SM), independently of the charged Higgs boson mass and tan β. In the context of Type-II 2HDM, SO(5) is the simplest of the three possible symmetry realizations of the scalar potential that can naturally lead to the SM alignment. Nevertheless, renormalization group effects due to the hypercharge gauge coupling g′ and third-generation Yukawa couplings may break sizeably this alignment in the MS-2HDM, along with the custodial symmetry inherited by the SO(5) group. Using the current Higgs signal strength data from the LHC, which disfavour large deviations from the SM alignment limit, we derive lower mass bounds on the heavy Higgs sector as a function of tan β, which can be stronger than the existing limits for a wide range of parameters. In particular, we propose a new collider signal based on the observation of four top quarks to directly probe the heavy Higgs sector of the MS-2HDM during the run-II phase of the LHC.

Subfields: Artificial Intelligence, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/03940861b361430c9983fb99499cb47a40c54d2a

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Citations in the corpus

Higgs Physics at the HL-LHC and HE-LHC (2019, background): “In the alignment limit, ↵ = ⇡/2 [380, 661, 662, 663, 664, 665, 666], the Yukawa couplings tend toward their SM value, i = 1.”
Physics at a 100 TeV pp collider: Higgs and EW symmetry breaking studies (2016, background): “In a general twoHiggs doublet model it is possible to satisfy β − α ≈ π/2, while still keeping light the new Higgs states [415, 417, 500, 501].”
Fully covering the MSSM Higgs sector at the LHC (2015, unknown): “[30, 50–56].”
Search for diphoton resonances in the mass range from 150 to 850 GeV in pp collisions at $s =$ 8 TeV (2015, background): “Under the assumption that the newly observed Higgs boson is the light CPeven Higgs scalar of the 2HDM, the consistency of its couplings with those predicted by the SM pushes the model close to the so called alignment limit [11], where certain decay modes of heavy neutral Higgs bosons vanish, includi”
Building and testing models with extended Higgs sectors (2017, methodology): “scalars essentially decouple from the electroweak scale phenomenology [178, 179, 180, 181]. Notice however that alignment can also take place without decoupling, which was illustrated for the 2HDM in [182, 183, 184]. In this case, the extra scalars, being moderately light, are essentially gaugeophob”
The hunt for the rest of the Higgs bosons (2015, background): “[18, 20].”
Scrutinizing the alignment limit in two-Higgs-doublet models: m h = 125 GeV (2015, background): “This restriction of scalar potential parameters has also been obtained in [55].”