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Searching for a charged Higgs boson with both H W Z and H tb couplings at the LHC

Journal of High Energy Physics, ISSN: 1029-8479, Vol: 2019, Issue: 1
2019
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Article Description

In certain new physics scenarios, a singly charged Higgs boson can couple to both fermions and WZ at tree level. We develop new strategies beyond current experimental searches using pp → jjH, H → tb at the Large Hadron Collider (LHC). With the effective HWZ and Htb couplings we perform a model-independent analysis at the collision energy s=13 TeV with the integrated luminosity of 3 ab. We derive the discovery prospects and exclusion limits for the charged Higgs boson in the mass range from 200 GeV to 1 TeV. With |F|, |A| ∼ 0.5–1.0 and 300 GeV ≲ mH± ≲ 400 GeV, we point out that a discovery significance of 5σ can be achieved. The constraints and projected sensitivities are also discussed in a realistic model, i.e., the modified Georgi-Machacek model without custodial symmetry. Our proposed search would provide direct evidence for a charged Higgs boson H that couples to WZ and tb, and has better sensitivity to the couplings of HWZ and Htb than current searches.

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