Abstract
Tiny neutrino masses can be explained by the type-II seesaw mechanism, where a triplet scalar under SU(2)L is predicted. Collider searches for this exotic scalar have been extensively conducted, especially for its doubly charged component Δ ± ± . Utilizing the forward detectors at the Large Hadron Collider (LHC), we study the probing sensitivity for the elastic photon fusion production of the scalars pp→p(γγ→Δ++Δ−−)p followed by the lepton-flavor-violating (LFV) decay channels Δ ± ± → e ± μ ± . With a high center-of-mass energy of 100 TeV and several luminosity scenarios, we can broaden the exclusion bounds in the parametric space of Br(Δ ± ± → e ± μ ± ) versus the triplet scalar mass mΔ. Specifically, at the 100 TeV LHC with an integrated luminosity of 3 ab−1, the mass exclusion limit at 95% C.L. based on the approximated significance formula can reach around 1150 GeV with the assumption of inverted neutrino mass hierarchy.