Higgs and Effective Field Theory - HEFT 2026

Session

Future colliders

8 Jun 2026, 16:30

Jardí Botànic, Valencia

82. Effective Field Theories at Future Colliders - Studies for the 2026 European Strategy Update

Jorge de Blas (Universidad de Granada (ES))

08/06/2026, 16:30

46. How large can lepton mixing be?

CHIARA GIULIANO - (Universidad de Granada)

08/06/2026, 17:00

We show that, contrary to common expectations, the observed charged leptons can have a substantial mixing with new heavier fermions, at the level of 20$\%$.
This can happen, in the language of effective theories, when the effect of mixing with heavier fermions vanishes at tree level in operators of mass-dimension 6 (or it is suppressed by the small charged lepton masses), a cancellation that...

31. Probing the τ lepton dipole moments at future colliders

Gabriele Levati

08/06/2026, 17:20

The electric and magnetic dipole moments of the electron and muon provide stringent tests of the Standard Model and sensitive probes of new physics. In contrast, the corresponding dipole moments of the tau lepton, well motivated in scenarios with enhanced couplings to third-generation fermions, remain weakly constrained. In our work, we investigate the potential to probe the tau dipole moments...

41. Global Fits at Future Colliders with the SMEFiT Framework

Jaco ter Hoeve (The University of Edinburgh)

08/06/2026, 17:40

In the context of the European Strategy, we present projections for the new physics reach of future high-energy colliders using the latest version of the SMEFiT framework, with a focus on near-term electron-positron colliders (FCC-ee, LEP3 and LCF). We quantify their sensitivity to the SMEFT parameter space in a global analysis while accounting for renormalization group evolution effects and...

30. The SMEFT as a New Physics Microscope at the FCC-ee

Juan Rojo Chacon (Nikhef National institute for subatomic physics (NL))

08/06/2026, 18:00

The unprecedented precision expected at the FCC-ee offers unique chances to unveil sought-for New Physics signals. However these "BSM searches" will be very different from current searches at LHC, since signals will appear as subtle deviations between ultra-precise data and theory predictions. A blind applications of the global SMEFT fit is unlikely to be able to resolve these signals due to...