8 papers
Cutoff Scales in the Type-I 2HDM with Strongly First-Order Electroweak Phase Transitions: One-Step versus Multistep
Jin-Hwan Cho, Dongjoo Kim, Jinheung Kim +1
We investigate the UV viability of strongly first-order electroweak phase transitions (SFOEWPTs) in the Type-I two-Higgs-doublet model (2HDM), considering both the Normal and Inver…
Strong First-Order Electroweak Phase Transitions and Gravitational Waves in the Normal Two-Higgs-Doublet Model: A Comparative Study of the Four Yukawa Types and Thermal Resummation Schemes
Jin-Hwan Cho, Dongjoo Kim, Jinheung Kim +2
We present a comprehensive global analysis of strong first-order electroweak phase transitions (SFOEWPTs) and their associated stochastic gravitational-wave (GW) backgrounds within…
Can a pseudoscalar with a mass of 365 GeV in the 2HDM explain the CMS excess?
Chih-Ting Lu, Kingman Cheung, Dongjoo Kim +2
We analyze the CMS-reported t tbar excess within conventional Two-Higgs-Doublet Models of Types I, II, X, and Y, using the best-fit pseudoscalar parameters MA = 365 GeV, GammaA ove…
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…
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…
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…
Can a pseudoscalar with a mass of 365 GeV in two-Higgs-doublet models explain the CMS excess?
Chih-Ting Lu, Kingman Cheung, Dongjoo Kim +2
We investigate the recently reported excess by the CMS Collaboration within the framework of conventional Two-Higgs-Doublet Models (2HDMs). Considering all four types (I…
A Panoramic Study of -Factors for 111 Processes at the 14 TeV LHC
Dongjoo Kim, Soojin Lee, Hanseok Jung +3
In this comprehensive study, we investigate -factors () for a broad array of Standard Model processes at the 14 TeV LHC, which are piv…