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hep-ph2025
Intrinsic Properties of Large CP Violation in the Complex Two-Higgs-Doublet Model
Soojin Lee, A. Hammad, Dongjoo Kim +1
We investigate the parameter space supporting large CP violation (CPV) in the complex two-Higgs-doublet model with softly broken symmetry, where the 125~GeV Higgs boson is…
hep-ph2025
Multi-step Strong First-Order Electroweak Phase Transitions in the Inverted Type-I 2HDM: Parameter Space, Gravitational Waves, and Collider Phenomenology
Soojin Lee, Dongjoo Kim, Jin-Hwan Cho +2
We investigate the electroweak phase transition (EWPT) within the inverted Type-I two-Higgs-doublet model, where the observed Higgs boson is identified as the hea…
hep-ph2025
Emerging Photon Jets in the Hadronic Calorimeter: A Novel Signature of Neutral Long-Lived Particles at the LHC
Jinheung Kim, Dongjoo Kim, Soojin Lee +1
We propose a novel collider signature for neutral long-lived particles (LLPs): the emerging photon jet in the hadronic calorimeter (HCAL). This signature arises when a neutral LLP…