Higgs and Effective Field Theory - HEFT 2026

Session

Geometry, Positivity and Amplitudes

10 Jun 2026, 09:00

Jardí Botànic, Valencia

72. The Bundle Geometry of Quantum Field Theories

Joe Davighi (University of Cambridge (GB))

10/06/2026, 09:00

29. A Shortcut to SMEFT Amplitudes using EFT Geometry

Cristofer Caballeros

10/06/2026, 09:30

Effective Field Theories (EFTs) are a framework to probe physics beyond the Standard Model (BSM) in a model independent way. The Standard Model Effective Theory (SMEFT) provides an expansion of higher-dimensional operators that encode the effects of heavy new physics; however, in the operator basis there exists a redundancy in the space of field redefinitions which leaves on-shell amplitudes...

60. A Covariant Formalism for Scattering Ampltiudes up to 2-Loop Order

Mohammad Alminawi

10/06/2026, 09:50

Covariant Feynman rules allow for scattering amplitudes to be expressed in manifestly invariant forms under field redefinition. In this talk the derivation of the covariant rules and their validity at the tree, 1-loop and 2-loop level will be demonstrated. Additionally the use of geometric methods to obtain explicit expressions for the covariant rules will be showcased.

5. Progress in the Universal SMEFT

Tyler Corbett (University of Vienna)

10/06/2026, 10:10

I will discuss recent work in developing the Universal SMEFT approach, this will hopefully include two forthcoming papers:
1) The relevance of dimension-eight terms in Drell Yan from comparing the top-down and bottom-up approaches.
2) The geometry of the Universal SMEFT and its breaking pattern at one-loop.

56. Multi boson processes in EFTs via on-shell methods

Clara Hernández García (Universidad de Granada)

10/06/2026, 10:30

Multi-boson processes are a valuable tool for deepening our understanding of the dynamics of the Higgs boson. In this talk we evaluate if they can be used to shed some light on the question of its transformation under the Standard Model symmetry group. To address this we resort to the application of on-shell amplitude methods to processes involving massive vectors and scalars. We construct the...

73. Positivity in EFT renormalization and the operator product expansion

Jasper Roosmale Nepveu (National Taiwan University)

12/06/2026, 09:00

43. Quantum correction to the diffusion term in stochastic inflation from SdSET

Dr Andrea Federico Sanfilippo (Universidad de Granada)

12/06/2026, 09:30

Soft de Sitter Effective Theory (SdSET) is a promising candidate for the correct effective description of superhorizon modes of quantum fields in de Sitter spacetime. It is especially valuable for achieving control over theories with strong infrared effects. A prototypical example is the massless, minimally coupled scalar field, whose correlation functions are infrared-divergent in...

19. Unitarity bounds and sum rules in the SMEFT

Andrea Sainaghi (University of Padua)

12/06/2026, 09:50

We present a comprehensive reassessment of perturbative unitarity bounds in the dimension-six Standard Model Effective Field Theory, exploiting a new formalism based on spinor-helicity techniques to derive partial-wave unitarity bounds for generic $N \to M$ scattering amplitudes. We find that, in several cases, these theoretical constraints are already competitive with, or even stronger than,...