Abstract
The exotic decay modes of non-Standard Model Higgs bosons are efficient in probing the hierarchical Two Higgs Doublet Models (2HDM). In particular, the decay mode H±→HW± serves as a powerful channel in searching for charged Higgses. In this paper, we analyze the reach for H±→HW±→ toverline{t}W at a 100 TeV pp collider, and show that it extends the reach of the previously studied ττW final states once above the top threshold. Top tagging technique is used, in combination with a boosted decision tree classifier. At the low tan β region, almost the entire hierarchical Type-II 2HDM parameter space can be probed via the combination of all exotic decay channels.
Highlights
The direct search of non-SM Higgs bosons mostly focuses on their decays into other SM particles, similar to the channels of the 125 GeV SM-like Higgs boson study at the LHC
The exotic decays of a heavy non-SM Higgs into a light non-SM Higgs plus one SM gauge boson, or into two light non-SM Higgses dominate. Discovery potential of such exotic decay modes of non-SM like Higgses has been explored in the literature for A/H → HZ, AZ [11], H/A → H±W ∓ [12] and H± → AW ±/HW ± [13,14,15] at the 14 TeV LHC
Comparing with the yellow region, which is the reach for H± → HW ± → τ τ W ±, H → ttchannel enhances the reach above the top pair threshold with the help of top tagging technique
Summary
Current measurements on the properties of the 125 GeV Higgs have already imposed strong constraints on the 2HDM parameter space [7, 34], pushing towards the alignment limit of cos(β − α) 0. Note that under such limit, the charged Higgses H± preferably couple to the non-SM-like Higgses A or H: gH±hW ∓. Various flavor measurements [7, 38], mostly from B-system, provide indirect constraints on the charged Higgs mass mH±. Note that direct searches for non-SM neutral Higgs provide constraints on the 2HDM parameter space. A recent paper [41] summarises the status of neutral Higgs searches at the LHC, with both direct and indirect measurements
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