Constraints on a 2HDM with a singlet scalar and implications in the search for heavy bosons at the LHC. (24th September 2019)

• Record Type: Journal Article
• Authors: von Buddenbrock, Stefan; Cornell, Alan S; Iarilala, Elie D R; Kumar, Mukesh; Mellado, Bruce; Ruan, Xifeng; Shrif, Esra Mohammed
• Is Part Of: Journal of physics. Volume 46:Number 11(2019:Nov.)
• Publication Date: 2019-09-24
• Subjects: Higgs Boson -- singlet scalar -- heavy scalar -- multiple leptons; Nuclear physics -- Periodicals; Particles (Nuclear physics) -- Periodicals; Physique nucléaire -- Périodiques; Particules (Physique nucléaire) -- Périodiques; Kernfysica; Elementaire deeltjes; 539.7
• DOI: 10.1088/1361-6471/ab3cf6
• Languages: English
• ISSNs: 0954-3899

Abstract

Abstract: We study a two-Higgs doublet model extended with an additional singlet scalar (2HDM+S), and provide a brief introduction to the model and its parameters. Constraints are applied to the parameter space of this model in order to accommodate a number of features in the data that have been interpreted in von Buddenbrock et al (2018 J. Phys. G 45 115003) as the result of the H → Sh decay produced via gluon–gluon fusion and in association with top quarks. Implications on the phenomenology of the heavy pseudo-scalar ( A ) and charged scalar ( H + ) are discussed. In particular, the decays A → ZH and H + → W + H become prominent. This leads to final states with multiple leptons and b -quarks. The decay A → ZH → ZSh results in the production of a high transverse momentum Z produced in association with a lepton and two b -quarks with little additional jet activity. These predictions are compared to the data with model's benchmark points. With the parameters obtained here the model is able to accommodate the features at the LHC reported in von Buddenbrock et al (2018 J. Phys. G 45 115003). Without varying these parameters additional excesses in the Zb b ̄ and t t ̄ invariant mass spectra, and the production of 3 leptons plus two b -tagged jets can be explained assuming m A ≈ 600 GeV.