Leptonic scalars and collider signatures in a UV-complete model

We study the non-standard interactions of neutrinos with light leptonic scalars ($\phi$) in a global $(B-L)$-conserved ultraviolet (UV)-complete model. The model utilizes Type-II seesaw motivated neutrino an $SU(2)_L$-triplet scalar, along additional singlet scalar sector. This UV-completion leads to enriched spectrum and consequently new observable signatures. examine low-energy lepton flavor violation constraints, as well perturbativity unitarity constraints on parameters. Then we lay out search strategy for unique signature resulting from at hadron colliders via processes $H^{\pm\pm} \to W^\pm \phi$ $H^\pm both small large Yukawa coupling cases. find that these associated production HL-LHC, prospects doubly-charged $H^{\pm\pm}$ can reach up 800 (500) GeV 1.1 (0.8) TeV $2\sigma \ (5\sigma)$ significance couplings, respectively. A future 100 collider will further increase mass reaches 3.8 (2.6) 4 (2.7) TeV, significance, also demonstrate $\phi$ be determined about 10% accuracy LHC case even though it escapes missing energy detectors.