Conveners
WG3 parallel session: WG3 parallel session
- Rui Santos (ISEL and CFTC-UL)
WG3 parallel session
- Rui Santos (ISEL and CFTC-UL)
Theories with multiple Higgs doublets allow Higgs couplings to significantly deviate from Standard Model values, enabling indirect probes of extra scalars. The observed couplings already place stringent limits on such theories. In this talk, I will review the situation in models with two Higgs doublets and then extend into three Higgs doublets. For more than two doublets, there are five...
I will present the collider phenomenology of a vector-like top partner (VLT) within the Type-II Two-Higgs-Doublet Model (2HDM-II) extended by a vector-like quark doublet. The study focuses on final states involving a charged Higgs boson. In this framework, the VLT predominantly decays through exotic channels, leading to signatures with high $b$-jet multiplicity and leptonic components. The...
We present a phenomenological study where an invisible scalar mediator is produced in association with a top-quark pair at the Large Hadron Collider (LHC). Using a $t\bar{t}$ experimental-like analysis, we search for light scalar particles that could be hidden in the $t\bar{t}$ final state. The signal process $pp \rightarrow t\bar{t}Y_0$ is generated within a simplified dark matter (DM) model...
Charged Higgs-pair production at hadron colliders provides an option to obtain information about the trilinear couplings involving charged Higgs states of BSM Higgs potentials. We analyze the corresponding production modes, Drell–Yan-like production, gluon fusion and vector-boson fusion at next-to-leading order with respect to the corresponding uncertainties originating from the scale...
We investigated the collider phenomenology of Vector-like Quarks (VLQs) - specifically the top ($T$) and bottom ($B$) quarks within the framework of the Two-Higgs-Doublet Model Type II (2HDM-II), considering both singlet and doublet representations. While current LHC searches constrain VLQs decaying exclusively into Standard Model (SM) final states, the presence of additional scalars in the...
Extended scalar sectors can significantly influence the cosmological evolution of the early universe. The additional scalar degrees of freedom allow for strong first-order phase transitions (SFOPT) into the electroweak-broken vacuum, which induce gravitational waves that, for sufficiently strong signals, might be detectable in the near future. Additionally, the universe might have undergone...
Many well-motivated extensions of the Standard Model predict new, entirely bosonic sources of CP violation (CPV). In these scenarios, the simultaneous observation of carefully selected bosonic processes emerges as a simple yet powerful method to unambiguously reveal the presence of CPV. The present study, which establishes a promising framework of CPV searches for the upcoming HL-LHC era,...
We investigate the potential of future electron-positron colliders, such as FCC-ee and CEPC, to probe 2-Higgs-doublet models (2HDMs) that facilitate a strong first-order electroweak phase transition (SFOEWPT), a necessary condition for electroweak baryogenesis. Focusing on a 2HDM in the CP-conserving limit, we identify parameter regions consistent with an SFOEWPT and evaluate their...
