We explore the phenomenology of three Higgs doublet scenario, where the scalar potential is augmented by Z3×Z2 symmetry making one doublet inert. Thus in effect, our model of interest is two Higgs plus inert Higgs doublet model charged under Z3 ((2+I)HDM-Z3) symmetry. We observe a blind spot feature for dark matter direct detection, as the tree-level dark matter-nucleon scattering cross-section vanishes depending on the mass splitting of dark sector particles. We perform a detailed analysis based on vacuum stability, unitarity, relic abundance, and direct detection results on the model. We also perform profile likelihood analysis and constrain the corresponding parameter space.
@article{arxiv.2508.13583,
title = {Inert dark matter in three Higgs doublet model: a blind spot narrative},
author = {Amit Dutta Banik and Tapoja Jha and Eija Tanskanen},
journal= {arXiv preprint arXiv:2508.13583},
year = {2025}
}