Conveners
Model Building
- Luca Vecchi
The Standard Model gauge group that describes strong and electroweak interactions in nature is based on the universal cover SU(3)_c x SU(2)_L x U(1)_Y, which can be moded by discrete symmetries Z_p, where p={1, 2, 3, 6}. Each of these possibilities recovers the usual Standard Model matter fields but also allows for new distinct representations. We will explore the allowed hypercharge spectra...
We present a minimal cosmological solution to the hierarchy problem. Our model consists of a light pseudoscalar and an extra Higgs doublet in addition to the Standard Model field content. We consider a landscape of vacua with varying values of the electroweak vacuum expectation value (VEV). The vacuum energy in our model peaks in a region of the landscape where the electroweak VEV is...
QCD-like theories are of interest in various areas of beyond-Standard-Model phenomenology, including composite Higgs models and strongly interacting pionic dark matter. The low-energy effective field theories provide a framework for describing the dynamics of such strongly coupled gauge theories.
In this work, we present next-to-leading order (NLO) expressions for masses, condensates, decay...
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...
We develop a formalism based on spinor-helicity techniques to generalize the formulation of perturbative unitarity bounds. We discuss unitarity bounds for $N \to M$ (with $N, M \geq 2$) scattering processes, relevant for high-energy future colliders, and spin-2 or higher-spin theories, relevant for effective field theories of gravity, that are not approachable by standard methods. As a...
