Higgs and Effective Field Theory - HEFT 2025

Session

Extended Scalars

5 Jun 2025, 11:00

503/1-001 - Council Chamber (CERN)

Conveners

Extended Scalars

• Maria Pestana Da Luz Pereira Ramos

63. Matching and decoupling in extended scalar sectors

David Sutherland

05/06/2025, 11:00

13. Exploring the EFT Alps: HEFT, SMEFT, and ALPs in Multi-Boson Production

Dr Alexandre Salas-Bernárdez (Universidad Complutense de Madrid)

05/06/2025, 11:30

Recently, the ATLAS and CMS experiments have been accumulating increasing statistics on the production of two electroweak (EW) bosons or more, such as HH and WWZ. These multi-boson final states are essential for probing the nature of the EW symmetry-breaking sector and its potential extensions within the framework of Effective Field Theories (EFTs), both in the linear realization (SMEFT) and...

43. Double ALP production at the LHC

Mr Simone Meoni (INFN, University of Bologna (IT))

05/06/2025, 11:50

Axion-like particles (ALPs) are hypothetical pseudoscalar states that emerge as pseudo-Nambu-Goldstone bosons from the breaking of an approximate global $ U(1) $ symmetry. They appear in several extensions of the Standard Model, offering potential solutions to the strong CP problem, the muon $(g\!-\!2)$ anomaly, neutrino mass generation, and dark matter. While most collider-based studies focus...

52. Electroweak Vacuum Metastability from Axion-Higgs Criticality

Maximilian Detering

05/06/2025, 12:10

Self-organised criticality, realised through cosmological dynamics in the early universe, is an alternative paradigm for addressing the electroweak hierarchy problem. In this scenario, an unnaturally light Higgs boson is the result of dynamics driving the electroweak vacuum towards a near-critical metastable point where the Higgs mass is bounded from above by the vacuum instability scale. To...