Doubly charged Higgs production at future ep colliders

The Higgs sector of the standard model can be extended by introducing an SU(2) L Higgs triplet Delta to generate tiny neutrino masses in the framework of the type-II seesaw mechanism. In this paper, we study the pair production of the introduced Higgs triplet at future e(-)p. colliders. The corresponding production cross sections via the vector boson fusion process at the FCC-ep and ILC circle times FCC are predicted, where the production of a pair of doubly charged Higgs is found to be dominant and then used to investigate the collider phenomenology of the Higgs triplet. Depending on the size of the Higgs triplet vacuum expectation value, the doubly charged Higgs may decay into a pair of same-sign charged leptons or a pair of same-sign W bosons. To explore the discovery potential of the doubly charged Higgs at future e(-)p colliders, we discuss these two decay scenarios in detail and show their detection sensitivity based on the mass of the doubly charged Higgs.