Conveners
Theories of New Strong Dynamics
- Giacomo Cacciapaglia
Theories of New Strong Dynamics
- Giacomo Cacciapaglia
Theories of New Strong Dynamics
- Oleksii Matsedonskyi (Weizmann Institute)
We present a simple mechanism for generating a Higgs quartic in composite Higgs models without a corresponding quadratic term. The extra quartic will originate from a Higgs dependent kinetic mixing between additional fermionic states. The mechanism can be naturally embedded to models with maximal symmetry as well as Twin Higgs models. The resulting Twin Higgs models will have a fully natural...
Providing an Ultra-Violet completion valid up to the Planck scale is of paramount importance to validate the composite Higgs paradigm, on a par with supersymmetry. We propose the first complete framework, based on partial unification of a confining hypercolor gauge group with the Standard Model color group, where couplings of the standard model fermions are mediated by both gauge and scalar...
We describe examples of renormalizable field theories where the breaking of chiral symmetry at the UV cutoff leaves behind at low energy dynamically generated elementary particle masses in a way alternative to the Higgs mechanism. In this scenario 1) the scale of the elementary particle masses is set by the RGI scale of the theory 2) masses are kept ``small'' owing to an enhanced chiral...
We investigate the astrophysical and collider constraints of an effective model featuring a scalar top-philic heavy dark matter candidate and a dimension-?five contact interaction term, as motivated by possible underlying extensions of the Standard Model such as composite Higgs models. We show that the presence of contact interactions can have a major impact on the dark matter relic density as...
Deviations from the SM in high energy longitudinal vector boson scattering might be the first evidence of a composite electroweak symmetry breaking sector. In this talk I will discuss the theoretical expectations and experimental prospects for this process in composite Higgs models. I will also compare it with searches for scalars that are typical in this class of model.
The Tera-Z phase of future $e^+ e^-$ colliders, FCC-ee and CepC, is a goldmine for exploring $Z$ portal physics. We focus on axion-like particles (ALPs) that can be produced via $Z$ decays with a monochromatic photon. As a template model, we consider composite Higgs models with a light pseudo-scalar that couples through the Wess-Zumino-Witten term to the electroweak gauge bosons. For both...
The QCD axion, based on the existence of the anomalous Peccei-Quinn (PQ) symmetry, realizes a simple and elegant solution to the strong CP problem. However, explicit realizations are extremely sensitive to PQ-violating effects in the UV, which can destabilize the axion potential and spoil the solution. In this talk, we introduce a class of composite axion models that provide a natural solution...
We study the occurrence of a strong first-order electroweak phase transition in composite Higgs models. Minimal constructions realising this scenario are based on the coset SO(6)/SO(5) which delivers an extended Higgs sector with an additional scalar. In such models, a two-step phase transition can be obtained with the scalar singlet acquiring a vacuum expectation value at intermediate...
Dark gauge sectors are well-motivated extensions of the Standard Model which may have interesting cosmological consequences. In this talk I will discuss the treatment of confinement and/or chiral phase transitions in dark QCD-like sectors, using Polyakov-extended chiral effective models. The implication for gravitational wave signatures in these type of theories will be explored.
We study electroweak baryogenesis in the SO(6)/SO(5) composite Higgs model with the third generation quarks being embedded in the 20′ representation of SO(6). The scalar sector contains one Higgs doublet and one real singlet, and their potential is given by the Coleman-Weinberg potential evaluated from the form factors of the lightest vector and fermion resonances. We show that the resonance...
A possible explanation of the origin of baryon asymmetry in the universe is provided by electroweak (EW) baryogenesis, where the asymmetry is generated during a first-order phase transition. This can be realized in the presence of new physics that modify the Higgs dynamics.
Non minimal Composite Higgs models based on the coset SO(6)/SO(5) offer a suitable extension of the SM Higgs sector...
A strongly-coupled sector can feature a supercooled confinement transition in the early universe. When fundamental quanta of the strong sector are swept into expanding bubbles of the confined phase, the distance between them is large compared to the confinement scale. The flux linking the fundamental quanta then deforms and stretches towards the wall, producing an enhanced number of composite...
