# Type-II seesaw scalar triplet model at a 100 TeV *pp* collider: discovery and higgs portal coupling determination

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## Abstract

We investigate the collider phenomenology of the scalar triplet particles in the Type-II seesaw model at a 100 TeV *pp* collider. Depending on triplet vacuum expectation value *v*_{Δ}, the dominant discovery channels could be *H*^{++}*H*^{−−} and *H*^{±±}*H*^{∓}. We find the *H*^{±±}*H*^{∓} → *W*^{±}*W*^{±}*hW*^{∓}*/ℓ*^{±}*ℓ*^{±}*hW*^{∓} channels are promising for both model discovery at relatively large *v*_{Δ} and determination of the Higgs portal couplings *λ*_{4} and *λ*_{5}. We also find that these two channels are complementary to indirect determination of *λ*_{4} from future precise measurements on *h* → *γγ* decay rate. Together with pair production of the doubly-charged Higgs subsequently decaying into same-sign di-leptons, the *H*^{±±}*H*^{∓} channels have the potential to cover a significant portion of the parameter space of the Type-II seesaw complex scalar triplet model.

## Keywords

Beyond Standard Model Hadron-Hadron scattering (experiments) Higgs physics## Notes

### **Open Access**

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