Probing the $$H^\pm W^{\mp } Z$$ H ± W ∓ Z interaction at the high energy upgrade of the LHC

Abstract

Abstract An $$H^\pm W^{\mp } Z$$ H ± W ∓ Z interaction at the tree level is a common feature of new physics models that feature scalar triplets. In this study, we aim to probe the strength of the aforementioned interaction in a model-agnostic fashion at the futuristic 27 TeV proton-proton collider. We assume that the $$H^\pm $$ H ± couples dominantly to ( $$W^\pm ,Z$$ W ± , Z ) and (t, b) and specifically study the processes that involve the $$H^\pm W^{\mp } Z$$ H ± W ∓ Z vertex at the production level, that is, $$p p \rightarrow H^\pm j j$$ p p → H ± j j and $$p p \rightarrow Z H^\pm $$ p p → Z H ± . Moreover, we look into both $$H^\pm \rightarrow W^\pm Z,~t b$$ H ± → W ± Z , t b decays for either production process. Our investigations reveal that the $$H^\pm j j$$ H ± j j production process has a greater reach compared to $$Z H^\pm $$ Z H ± . Moreover, the discovery potential of a charged Higgs improves markedly with respect to the earlier studies corresponding to lower centre-of-mass energies. Finally, we recast our results in the context of the popular Georgi–Machacek model.