Abstract
The presence of charged Higgs bosons is a generic prediction of multiplet extensions of the Standard Model (SM) Higgs sector. Focusing on the Two-Higgs-Doublet-Model (2HDM) with type I and lepton-specific Yukawa sectors, we discuss the charged Higgs boson collider phenomenology in the theoretically and experimentally viable parameter space. While almost all existing experimental searches at the LHC target the fermionic decays of charged Higgs bosons, we point out that the bosonic decay channels — especially the decay into a non-SM-like Higgs boson and a W boson — often dominate over the fermionic channels. Moreover, we revisit two genuine BSM effects on the properties of the discovered Higgs boson — the charged Higgs contribution to the diphoton rate and the Higgs decay to two light Higgs bosons — and their implication for the charged Higgs boson phenomenology. As main result of the present paper, we propose five two-dimensional benchmark scenarios with distinct phenomenological features in order to facilitate the design of dedicated LHC searches for charged Higgs bosons decaying into a W boson and a light, non-SM-like Higgs boson.
Highlights
— is the first of its kind, and the thorough investigation of its properties is of paramount importance for the understanding of particle physics
The Higgs field may interact with the dark matter (DM) sector through so-called Higgs portal interactions, or DM itself may be composed of a stable scalar particle that originates from an extension of the Standard Model (SM) Higgs sector
A beyond the SM (BSM) scalar sector may lead to a strong first-order EW phase transition and feature new sources of CP-violation — these may enable the successful generation of the baryon asymmetry observed in the Universe
Summary
A genuine prediction of Lorentz- and gauge-invariant BSM theories with additional scalar. In the alignment limit where one of the neutral CP-even Higgs bosons is SM-like, hj = hSM, these correlations imply i g(Hi±W ∓hj) = 0. In the special case of the CP-conserving Two-Higgs-Doublet Model (2HDM), which contains only two CP-even neutral Higgs bosons and a single pair of charged Higgs bosons, this implies that the coupling between the charged Higgs boson, the non-SM-like CP-even Higgs boson and the W boson is maximal in the alignment limit. We shall focus on the first case, eq (2.14), in this work
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