With the expected amount of present and future LHC data, top-quark-related phenomena that very scarcely arise offer new ways to test the Standard Model and probe physics beyond it. In this talk, we focus on two of those phenomena: four-top production and toponium formation. In the former case, we examine effective field theory interpretations of current and expected limits, compare them with...
Starting from collider energies of a few TeV, electroweak vector boson fusion/scattering becomes the dominant production mode at lepton colliders for Standard Model and new physics processes that are relevant to studying the EW sector. We show that in this regime a muon collider would effectively act as a ``high-luminosity weak boson collider,'' offering a wide range of opportunities to...
Collider searches face the challenge of defining a representation of high-dimensional data such that physical symmetries are manifest, the discriminating features are retained, and the choice of representation is new-physics agnostic. We introduce JetCLR to solve the mapping from low-level data to optimized observables though self-supervised contrastive learning. As an example, we construct a...
Four-top production is one of the last benchmarks of the SM explored at the LHC, and the intersection of state of the art experimental techniques and theoretical calculations. In this talk, we give a brief review of the main problems one faces when trying to disentangle signal from background in such a complex final state with a special empashisis on the role of Monte Carlo simulations. We...
I will discuss the forward-backward asymmetry in $pp\to\ell^+\ell^-$ at the Z peak within the Standard Model Effective Field Theory (SMEFT). This observable provides per mille level constraints on the vertex corrections of the Z boson to quarks, which close a flat direction in the electroweak precision fit of the flavourful SMEFT. Moreover, we show that current LHC data are precise enough so...
Various possibilities for testing lepton dipole moments in high-energy collider experiments are investigated. A Muon Collider running at center-of-mass energies of several TeV could provide the first model-independent high-energy test of new physics in the muon g-2, being sensitive to deviations of few $\times\, 10^{-9}$, thus being able to shed light on the long-standing muon g-2 anomaly. At...
New particles $\phi$ in the MeV-GeV range produced at colliders and escaping detection can be searched for at operating b− and $\tau$−factories such as Belle II. A typical search topology involves pair-produced $\tau$s (or mesons), one of which decaying to visibles plus the $\phi$, and the other providing a tag. One crucial impediment of these searches is the limited ability to reconstruct the...
