Higgs and Effective Field Theory - HEFT 2025

Session

Higgs and Electroweak III

5 Jun 2025, 14:00

503/1-001 - Council Chamber (CERN)

Conveners

Higgs and Electroweak III

• Maria Pestana Da Luz Pereira Ramos

51. Probing SMEFT via the Lam-Tung Relation

Xu Li (INFN)

05/06/2025, 14:00

The violation of the Lam-Tung relation in the Drell-Yan process serves as a sensitive observable for probing dipole operators as well as three scalar and tensor types of four-fermion operators. Since these operators do not interfere with the SM, their leading contributions to the violation arise at order $1/\Lambda^{-4}$. In this talk, we explore different strategies for constraining these...

50. Multi-Higgs production as probes of HEFT interactions

Anisha . (Karlsruhe Institute of Technology)

05/06/2025, 14:20

Using the framework of the Higgs Effective Field Theory (HEFT), I will discuss multi-Higgs production via gluon-gluon fusion (ggF) and weak boson fusion (WBF). For ggF-induced multi-Higgs production, I will highlight the impact of one-loop HEFT modifications on the Higgs self-couplings and study their effects on the production rates. By including these one-loop radiative corrections and going...

22. Faking neutral triple gauge vertices with vector-like quarks

Fabian Esser

05/06/2025, 14:40

Neutral triple gauge couplings (NTGCs) provide important tests of the gauge sector of the SM and are searched for at the LHC via the process $pp \rightarrow ZZ \rightarrow 4l$ with two on-shell Z bosons.
In the SMEFT, NTGCs are produced at dimension-8 and at 1-loop order, making them doubly suppressed.
A promising alternative interpretation to NTGC searches are SM extensions with vector-like...

47. UV constraints on effective theories with extra vector bosons

Clara Hernández García (Universidad de Granada)

05/06/2025, 15:00

The leading direct and indirect observable effects of arbitrary extra particles of spin 1 are conveniently described by a general effective theory with Proca vector bosons that belong to certain representations of the Standard Model gauge group. Assuming a good high-energy behaviour, we further restrict the possible representations of the extra vectors and derive constraints on their couplings...