GenHET Meeting in Beyond the Standard Model

Session

Lightning talks - 2

26 Feb 2026, 15:30

4/3-006 - TH Conference Room (CERN)

40. Could electron-top interactions spoil the measurement of the Higgs trilinear? A quantitative estimate at future lepton colliders

Lucine Tabatt (Humboldt Universität zu Berlin)

26/02/2026, 15:30

The measurement of the Higgs self-coupling is considered the next milestone
in the study of the Higgs boson properties. At future $e^+e^-$ facilities below
the double Higgs production threshold, this is extracted from the $Zh$
production cross-section, which is sensitive to the trilinear coupling at the
one-loop level. At the same perturbative order, potential effects beyond the
Standard...

5. LFV decays of Resonance particles in the context of non-universal Z' model

Ms Swagata Biswas (National Institute of Technology Durgapur)

26/02/2026, 15:40

The governing interaction in the subatomic world is the strong interaction,
and it is explained by Quantum Chromodynamics (QCD), which is the final
symmetry of the Standard Model (SM). Physics beyond the SM is required to
explain numerous unsolved empirical and theoretical problems in high energy
physics. Lepton Flavour Violation (LFV) is one of the tantalizing topics of High
Energy...

56. Quantum spin correlations at colliders

Monika Wüst (University of Würzburg)

26/02/2026, 15:50

The study of beyond-classical correlations in final states at colliders
has received a lot of attention recently. For example, entanglement
of particle pairs has been observed at the LHC. Most importantly,
measurements of such correlations provide new tests of the Standard
Model. More complicated final states are being studied and future colliders with polarized initial states will boost...

43. Benchmarking dark matter candidates in the 2HDMS: Prospects for future colliders

Julia Ziegler (UNI/TH (Uni Hamburg, Institut fuer Theoretische Physik))

26/02/2026, 16:00

The Two Higgs Doublet model extended with a complex scalar singlet
(2HDMS) is a well-motivated Beyond-the-Standard Model candidate with the
potential to explain dark matter (DM). The extended scalar sector results
in three scalar, two charged, one pseudo-scalar and one pseudo-scalar DM
candidate. The DM candidate is provided by the imaginary component
of the complex scalar singlet. It is...

53. Are quantum observables sensitive to CP-violation in $t\bar{t}$ pairs?

Olimpia Miniati (Università degli Studi di Bologna and INFN)

26/02/2026, 16:20

Within the framework currently adopted for the description of the fundamental interactions, the particles involved in high-energy collisions are expected to exhibit a basic quantum behaviour.
As a consequence of this statement, a novel class of "quantum" observables for collider studies naturally arises, whose physical interpretation is rooted in the characteristics of the underlying quantum...

58. Mixing it Up: New Paths to Sterile Neutrino Dark Matter

Finn Anthony Mulder (University of Padova, INFN Padova)

26/02/2026, 16:30

Sterile neutrinos are attractive dark matter candidates due to their feeble interactions with the Standard Model, cosmological longevity, and natural emergence in extensions of the neutrino sector. Early production mechanisms based on non-resonant active–sterile oscillations, most notably the Dodelson–Widrow (DW) mechanism, are now known to be insufficient to account for the observed dark...

52. Gauge theories from scattering amplitudes with minimal assumptions

Clara Hernández García (Universidad de Granada)

26/02/2026, 16:40

We revisit the emergence of a Yang-Mills symmetry in theories with massless spin 1 particles from fundamental physical properties of scattering amplitudes. In the standard proofs, some symmetry and reality properties of the coupling constants in three-point amplitudes are assumed. These properties cannot be justified using only three-point amplitudes but we show that they arise as consequences...

47. DM genesis in the reheating era

Kuldeep Deka (New York University Abu Dhabi)

26/02/2026, 16:50

The post-inflationary reheating era plays a pivotal role in shaping the thermal history of the Universe, yet its dynamics remain poorly understood. In this talk, I will examine how various reheating scenarios impact dark matter (DM) production, encompassing both thermal and non-thermal origins. Using general parametrizations for the Hubble expansion rate and the evolution of the Standard Model...

8. Unveiling Large CP Violation in the C2HDM: From eEDM Bounds to Hidden Sectors

Prof. Jeonghyeon Song (Konkuk University)

In this talk, we investigate the conditions required to support large CP violation in the Complex Two-Higgs-Doublet Model (C2HDM). By performing a comprehensive global scan of Type-I and Type-II models—incorporating theoretical stability, collider constraints, and the stringent electron EDM (eEDM) bound—we identify distinct phenomenological pathways to large CP-violating effects. We show that...