International Workshop on Future Linear Colliders 2026

Session

Beyond Standard Model

11 Nov 2026, 16:30

KEK

144. A DM candidate indicated at Fermi-LAT and LZ ? Connection with LHC and LC perspectives

Francois Richard (LAL Orsay)

Beyond the Standard Model

Oral presentation (remote)

Recently an analysis of Fermi-LAT data has claimed a significant excess of energetic photons centred around 20 GeV, in the halo of our galaxy. This excess can be interpreted as coming from SUSY dark matter (DM) objects with a mass of few 100 GeV which annihilate into hadronic jets containing photons mainly from neutral pions. This observation is independently backed up by an observation of the...

127. CP-violation in the complex 2HDM

Gudrid Moortgat-Pick

Beyond the Standard Model

Oral presentation (onsite or remote - not decided)

We investigate CP-violation in the complex singlet extension of the general Two Higgs Doublet Model (2HDM) with Yukawa alignment condition.
We first explore the possibility of explicit CP-violation in the extended scalar sector while the 125 GeV Higgs remains exactly Standard Model (SM)-like. We identify an additional source of CP violation in the complex singlet extension compared to the...

9. Dark Matter Determination at future e+e- Colliders

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

Beyond the Standard Model

Oral presentation

We assume that the lightest SUSY particle, the lightest neutralino (n1) is our DM candidate (in the MSSM or the NMSSM). We use future e+e- data, particular on the production cross section of the lightest chargino, to reconstruct the underlying parameters and thus to determine the relic density, to be compared with the measured value. The concrete examples are taken from the excesses seen by...

7. Dark Matter Searches as Probes of Reheating at Future Linear Colliders

Abhik Sarkar (Indian Institute of Technology Guwahati)

Beyond the Standard Model

Oral presentation (onsite or remote - not decided)

Future high-energy $e^+e^-$ colliders offer an unprecedented opportunity to explore dark matter scenarios with feeble interactions that remain inaccessible to current hadron colliders. In this presentation, we demonstrate how future lepton colliders can not only discover such dark matter candidates but also probe the thermal history of the Universe. We investigate two scenarios: (1)...

19. Decay-mode independent searches for new light scalars at future Higgs factories

Maria Teresa Nunez Pardo De Vera

Beyond the Standard Model

Oral presentation (remote)

Many BSM models predict the existence of additional Higgs-like scalars and the future Higgs factories are best suited for searching them being produced in association with a Z boson. Assuming a small coupling to the Z boson, such scalars are still not excluded by current experimental and theoretical constraints, and different approaches have been considered when studing prospects of their...

128. Phase Transitions in the THDMS

Gudrid Moortgat-Pick

Beyond the Standard Model

Oral presentation (onsite)

We study FOEWPT in the 2HDMS and compare with results from the the N2HDM.
We have BSMPT for this model and have analyzed only benchmark points that are in agreement with all experimental, theoretical and cosmological bounds. We have studied collider phenomenology for these points at future colliders, HL-LHC, e+e- colliders (ILC, LCF and CLIC).

41. Prospects for light exotic scalar measurements in di-tau decay channel at future Higgs factories

Aleksander Filip Zarnecki (University of Warsaw)

Beyond the Standard Model

Oral presentation (remote)

The physics program of the Higgs factory is expected to focus on measurements of the 125 GeV Higgs boson, with the Higgs-strahlung process, production of the Higgs boson together with the Z boson, being the dominant production channel at 250 GeV. However, production of an extra light scalar in an analogous scalar-strahlung process is still not excluded by the existing experimental data,...

25. Searches for light exotic scalars in the $S\rightarrow b\bar{b}$ decay channel at future Higgs factories

Bartłomiej Brudnowski (University of Warsaw)

Beyond the Standard Model

Oral presentation (remote)

Light exotic scalar particles, which are predicted by many BSM models, are still not excluded by the existing experimental data and theoretical constraints, provided their couplings to SM states are small. Many search strategies have been considered, which either make use of a specific decay channel of the scalar or are independent of the decay. One of the promising search channels is...

8. Shedding light on Dark Matter Using Extended Higgs Sectors

Juhi Dutta

Beyond the Standard Model

Oral presentation (onsite or remote - not decided)

Dark matter remains one of the most compelling indications of new physics beyond the Standard Model. In this talk, I will present theoretical frameworks accommodating dark matter candidates, focusing on their dark matter phenomenology and how their signatures can be explored at collider experiments, alongside direct and indirect detection searches. I will place particular emphasis on extended...