Batra, NipunNipunBatraColeppa, BaradhwajBaradhwajColeppaKhanna, AkshatAkshatKhannaRai, Santosh KumarSantosh KumarRaiSarkar, AgnivoAgnivoSarkar2025-11-262025-11-262025-07-1510.1103/t5df-67wh2-s2.0-105021364743http://repository.iitgn.ac.in/handle/IITG2025/33534One of the standard ways to study scenarios beyond the Standard Model involves extending the Higgs sector. This work examines the three Higgs doublet model (3HDM) in a type-Z or democratic setup, where each Higgs doublet couples exclusively to a specific type of fermion. The particle spectrum of the 3HDM includes four charged Higgs bosons, two CP-odd scalars, and three CP-even scalars. This work investigates the allowed mass and coupling parameter space in the type-Z 3HDM after imposing all theoretical and experimental constraints. We extract the allowed parameter space under three distinct alignment-limit conditions or mass hierarchies leveraging machine learning techniques. Specifically, we analyze scenarios where the 125 GeV Higgs is the lightest, an intermediary, or the heaviest CP-even Higgs boson. Our findings indicate that while a single lighter CP-even Higgs boson below 125 GeV still remains a possibility, the presence of two lighter Higgses is ruled out.trueArticlehttps://doi.org/10.1103/t5df-67wh247000291-2515 July 20251015011WOS:001543997000007