Scalars 2025: Higgs bosons and cosmology

Session

Plenary 10

Sep 24, 2025, 11:00 AM

0.06 (University of Warsaw, Faculty of Physics)

Conveners

Plenary 10

• Howard Haber (University of California, Santa Cruz)

66. CP-violation in the Weinberg 3HDM potential

Margarida Nesbitt Rebelo (CFTP/IST, U. Lisboa)

9/24/25, 11:00 AM

Plenary

We explore the phenomenology of Weinberg's Z2 times Z2 symmetric three-Higgs-doublet potential, allowing for spontaneous violation of CP due to complex vacuum expectation values. An overview of all possible ways of satisfying the stationary-point conditions is given, with one, two or three non-vanishing vacuum expectation values, together with conditions for CP conservation in terms of basis...

36. 3HDM based on CP symmetry of order 4: the story so far

Prof. Igor Ivanov (Sun Yat-sen University)

9/24/25, 11:30 AM

Plenary

CP4 3HDM is a peculiar three-Higgs-doublet model in which a single symmetry, the CP symmetry of order 4, leads to tight constraints on the scalar and Yukawa sectors. The model does not possess the decoupling limit; moreover, tree-level flavor-changing neutral couplings are unavoidable although they can be suppressed. Thus, it remains an open question if the model can pass experimental...

83. Maximal CP violation from long-range forces

Anna Socha

9/24/25, 12:00 PM

Plenary

CP violation plays a crucial role in explaining the observed matter–antimatter asymmetry of the Universe. While standard baryo-/leptogenesi scenarios typically predict small CP asymmetries arising from the interference between tree-level and loop-level diagrams, we demonstrate that scatterings of non-relativistic particles mediated by a light force carrier can generate order-1 CP asymmetries...

80. Di-Higgs and New Physics

Stefano Moretti

9/24/25, 12:30 PM

Plenary

I review the sensitivity of the di-Higgs process at the Large Hadron Collider to fundamental theories of the electroweak scale.