International Workshop on Future Linear Colliders 2026

Session

Joint: Higgs/EW and BSM

10 Nov 2026, 14:00

KEK

81. Probing the Real Triplet Higgs Model with Higgsstrahlung at future electron-positron colliders

Mohamed Younes SASSI (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)

10/11/2026, 14:00

Beyond the Standard Model

Oral presentation (onsite)

Future $e^+e^-$ colliders will measure the Higgsstrahlung cross section $e^+e^- \to Zh$ with sub-percent precision, offering a unique window into probing extended scalar sectors. We present a complete one-loop electroweak calculation of this process in the real triplet Higgs model with a non-zero triplet vev, using a fully automated renormalisation procedure in the on-shell scheme. All...

26. On the Phenomenology of the Real Inert Singlet-Triplet Dark Matter Model at current and future colliders

Dr Johannes Braathen (DESY)

10/11/2026, 14:18

Beyond the Standard Model

Oral presentation (onsite)

I will present a comprehensive phenomenological study of the real inert singlet-triplet dark matter model. This model extends the Standard Model (SM) with 2 inert scalars: a gauge-singlet and an SU(2)_L-triplet with hypercharge 0. The analysis takes into account state-of-the-art theoretical and experimental constraints. A central focus of our work lies on beyond-the-SM (BSM) two-loop...

10. Model distinction at e+e- colliders: N2HDM vs. 2HDMS

Sven Heinemeyer (Consejo Superior de Investigaciones Cientificas (CSIC) (ES))

10/11/2026, 14:36

Beyond the Standard Model

Oral presentation (onsite)

We analyze two models, the 2HDM extended by a real singlet, N2HDM, and by a complex singlet (2HDMS) for the parameter space that yields a good description of the 95 GeV excesses observed by CMS, ATLAS and LEP. We demonstrate that the differences between the two models are manifest in the triple Higgs couplings. Precision measurements of various di-Higgs production channels can yield a model...

88. UV completion of extended Higgs sectors from dynamics of SU(2) gauge theory

Yushi MURA (KEK)

10/11/2026, 14:54

Beyond the Standard Model

Oral presentation (onsite)

Extended Higgs sectors are motivated by various problems beyond the Standard Model, such as dark matter, neutrino masses, and the baryon asymmetry of the Universe.
Future linear colliders provide powerful probes of such scenarios through precision measurements of Higgs properties, including the Higgs self-coupling.
In many extended Higgs models, scalar quartic couplings tend to grow toward...

56. A composite Higgs model of first order EW phase transition and its collider signatures

Yunita Kristanti Andriani (The University of Osaka)

10/11/2026, 15:12

Beyond the Standard Model

Oral presentation (onsite)

After the Higgs boson discovery, electroweak phase transition (EWPT) became a frontier of high-energy physics and cosmology. While EWPT is a crossover in the Standard Model, some of the promising BSM scenarios, like electroweak baryogenesis, require that it be strongly first-order. Extended Higgs models make it possible to realize such a strongly first-order EWPT. What is the fundamental model...

11. FOEWPT in the RxSM: LC opportunities

Sven Heinemeyer (Consejo Superior de Investigaciones Cientificas (CSIC) (ES))

12/11/2026, 14:00

Beyond the Standard Model

Oral presentation (onsite)

We analyze the SM extended by a real Higgs singlet, RxSM, in the parameter space that yields a First Order Electroweak Phase Transistion (FOEWPT, one of the requirements to explain the baryon asymmetry of the universe via electroweak baryogenesis). We demonstrate the physics opportunities for future high-energy e+e- colliders in such a scenario. In particular, we emphasis the complementarity...

12. BSM triple Higgs coupling determination with Neural Networks

Sven Heinemeyer (Consejo Superior de Investigaciones Cientificas (CSIC) (ES))

12/11/2026, 14:18

Beyond the Standard Model

Oral presentation

We use a Neural Network (NN) to determine the size of a BSM triple Higgs coupling, $\lambda_{hhH}$, where $h$ is the Higgs boson discovered at the LHC, and $H$ is a heavier CP-even Higgs boson. The underlying model is the SM extended by a real singlet (RxSM). Using the processes $e^+e^- \to Zhh$ and $e^+e^- \to \nu\bar\nu hh$, we feed the anticipated $m_{hh}$ invariant mass distributions into...

91. Enhanced CP Sensitivity in Higgs di-tau decays with Energy Correlators at Higgs factories

Anjan Kumar Barik (Tsung-Dao Lee Institute School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200120, China)

12/11/2026, 14:36

Beyond the Standard Model

Oral presentation (onsite)

The generic azimuthal angle difference between the decay planes of tau leptons are a powerful probe of CP violation in Higgs decays through tau polarisation. In the $\tau^\pm\to\rho^\pm\nu$ channel, the spin-analysing power is suppressed by the mixture of longitudinal and transverse $\rho$ polarisations, limiting the sensitivity. We propose an energy correlator-inspired method that enhances...

118. Neutrino mass, dark matter, and baryon asymmetry in a three-loop radiative seesaw model and its collider phenomenology

宙 谷口 (大阪大学)

12/11/2026, 14:54

Beyond the Standard Model

Oral presentation (onsite)

The Standard Model successfully describes particle physics but cannot explain neutrino oscillations, the baryon asymmetry of the universe (BAU), and dark matter. The Aoki-Kanemura-Seto (AKS) model is a new physics model that can explain these three phenomena simultaneously at TeV scale testable by future experiments. However, in the original model published in 2009, the baryon number was not...