Abstract
At the Large Hadron Collider (LHC), both the ATLAS and CMS Collaborations have been searching for light charged Higgs bosons via top (anti)quark production and decays channels, like pp → t overline{t} with one top (anti)quark decaying into a charged Higgs boson and a b (anti)quark, when the decay is kinematically open (i.e., when {m}_{H^{pm }} ≲ mt). In this paper, we propose new searches at the LHC involving light charged Higgs bosons via their pair production channels like pp → H±h/A and pp → H+H− in the 2-Higgs Doublet Model (2HDM) Type-I and -X scenarios. By focusing on the case where the heavy H state plays the role of the Standard Model (SM)-like Higgs boson with a mass near 125 GeV, we study the aforementioned Higgs boson pair production channels and investigate their bosonic decays, such as H± → W±h and/or H± → W±A. We demonstrate that for a light charged Higgs boson state, with {m}_{H^{pm }} ≲ mt, at the LHC, such di-Higgs production and decay channels can give rise to signatures with event rates much larger than those emerging from pp → t overline{t} → t overline{b} H− + c.c. We specifically study h/A → b overline{b} and τ+τ− decays. We, therefore, claim that the discussed combination of new production and decay modes can result in an alternative discovery channel for charged Higgs bosons lighter than the top (anti)quark at the LHC within the above two 2HDM Types. Finally, in order to motivate experimentalists in ATLAS and CMS to search for such signatures, we propose 16 Benchmark Points (BPs) which are compatible with both theoretical and experimental constraints.
Highlights
After Electro-Weak Symmetry Breaking (EWSB) takes place, of the 8 degrees of freedom initially present in Φ1 and Φ2, 3 correspond to the longitudinal components of W ± and Z0 while the remaining 5 appear as the physical Higgs fields mentioned in the previous section: h, H, A and H±
Again, for the 2-Higgs Doublet Model (2HDM) Type-I scenario and the parameter ranges given in table 2, we show the relative magnitudes of the production and decay rates of 4b final states from pp → H±h → W ±hh and from the two topquark processes
In order to examine the salient features of the advocated parameter space and to encourage experimentalists to search for such new discovery channels at the Large Hadron Collider (LHC), we propose eight Benchmark Points (BPs) for both the 2HDM Type-I and -X scenarios
Summary
It is well known that the presence of a single doublet in the SM plays a dual role, of generating the mass of both the gauge bosons and fermions (the latter via the introduction of Yukawa couplings). In the 2HDM Type-I, only the doublet Φ2 couples to all the fermions exactly like in the SM while in the 2HDM Type-X (or lepton-specific) all the quarks couple to Φ2 and the charged leptons couple to Φ1 If we extend such a Z2 symmetry to the scalar potential, wherein Φ1 → +Φ1 and Φ2 → −Φ2, this requires λ6 = λ7 = 0. From the phenomenological point of view, the most relevant features are that, in the 2HDM Type-X, the Higgs couplings to leptons enjoy an enhancement for large tan β while, in the 2HDM Type-I, the couplings to all fermions are suppressed if tan β 1
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