Search for ${\delta }^{\pm \pm }$ with new decay patterns at the LHC

Abstract

A study of searching for doubly charged Higgs $({\delta }^{\pm \pm })$ is performed in two-Higgs-doublet extension of the conventional type-II seesaw model. We find that a fantastic mixing effect between singly charged Higgs of Higgs doublet and of triplet is arisen from the scalar potential. The mixing leads to following intriguing phenomena: (a) the mass splittings in triplet particles are magnified, (b) QCD processes dominate the production of ${\delta }^{\pm \pm }$, and (c) new predominant decay channels of ${\delta }^{\pm \pm }$ are ${\delta }^{\pm \pm }\to W^{{\pm }^{[\ast ]}}{H}_{1(2)}^{{\pm }^{(\ast )}}$, but not ${\delta }^{\pm }\to ({\ell }^{\pm }{\ell }^{\pm },W^{\pm }{W}^{\pm })$ which are usually discussed in the literature. With luminosity of 40 fb${}^{-1}$ and collision energy of 13 TeV, we demonstrate that ${\delta }^{\pm \pm }$ with mass below $330$ GeV could be observed at the $5\sigma$ level. Moreover, when the luminosity approaches to 300 fb${}^{-1}$, the observed mass of ${\delta }^{\pm \pm }$ could reach up to 450 GeV.

21 pages, 12 figures, published version, title is slightly changed

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