友善列印 - 11/13 12:30 Dr. Soojin Lee (NTHU) Multi-step Electroweak Phase Transitions in the Inverted Type-I 2HDM: Gravitational Waves and Collider Signatures (R521, 5F, General Building II, Nat'l Tsing Hua Univ.)

11/13 12:30 Dr. Soojin Lee (NTHU) Multi-step Electroweak Phase Transitions in the Inverted Type-I 2HDM: Gravitational Waves and Collider Signatures (R521, 5F, General Building II, Nat'l Tsing Hua Univ.)

******** CTCD/NTHU HEP Seminar ********

Speaker ：Dr. Soojin Lee (NTHU)

Title ：Multi-step Electroweak Phase Transitions in the Inverted Type-I 2HDM: Gravitational Waves and Collider Signatures

Time ：12:30-13:30, Thursday, 2025/11/13

Place ：R521, 5F, General Building II, Nat'l Tsing Hua Univ.

Host ： Prof. Chong-Sun Chu (NTHU)

Abstract:
The absence of a Strong First-Order Electroweak Phase Transition (SFOEWPT) in the Standard Model necessitates the search for physics beyond the Standard Model (BSM) to realize electroweak baryogenesis. This seminar presents a detailed investigation of the EWPT within the inverted Type-I Two-Higgs-Doublet Model (2HDM), where the observed 125 GeV Higgs boson is identified as the heavier CP-even scalar H.

We performed a comprehensive scan of the parameter space, fully consistent with all theoretical and experimental constraints, to identify viable regions supporting an SFOEWPT, explicitly including multi-step transitions. We found both two-step and three-step SFOEWPTs. We calculated the strength of the SFOEWPT and the resulting Signal-to-Noise Ratios (SNR) for Gravitational Waves (GW) at LISA. Furthermore, we studied the collider phenomenology of these SFOEWPT parameter sets, identifying promising discovery channels at the 1.5 TeV CLIC.