Theory Division

In January 2020 the Department of Energy announced that the US Electron Ion Collider (EIC) had received a CD0 in December 2019, and that it would be located at BNL. The EIC will be built jointly by BNL and Jefferson Lab as partners. The EIC project setup in 2020 has picked up speed and steered... More »

On-shell methods have been shown to be a powerful tool to compute higher-point and loop amplitudes. However, most of the time we hear about the applications for renormalizable theories. In this talk, I will give an introduction to spinors and to (massless/massive) amplitudes and show that we can indeed apply these methods for general effective field... More »

The study of the Higgs boson properties is one of the main tasks of contemporary high-energy physics. At the LHC, gluon fusion is the main production channel of Higgs bosons, and mixed QCD-electroweak corrections represent one of the main sources of theoretical uncertainty for such process, known until few years ago only at leading order... More »

The fine structure constant is this “magic ” number close to 1/137 that appears in several areas of physics. This dimensionless constant characterizes the strength of the electromagnetic interaction between light and charged elementary particles, such as electron or muon. A precise knowledge of its numerical value is crucial to test, even with low-energy experiments,... More »

The observation of neutrinoless double beta decay would have far-reaching consequences for particle physics. Most prominently, it would give a hint on the origin of neutrino masses and on the scale at which they are generated. We will discuss the effective description of non-standard mechanisms triggering neutrinoless double beta decay and the implications of their... More »

In this talk I will discuss computations of NLO virtual corrections to four-point gluon-fusion processes; in particular the production of HH, ZH and ZZ. Recently these processes have been computed numerically, but they are not known analytically. I will discuss how one can perform an expansion of these amplitudes in the high-energy limit, and improve the resulting series through the... More »

I argue that in the 21st century no other area of particle physics has seen such a wealth of stimulating results as has the study of quark transitions. I assess the reasons for this progress, before surveying a selection of the most interesting recent results in the field. I conclude by looking forward to the... More »

Nature is such that Maximal Entangled states exist”. This conjecture is based on the fact that we not only observe maximal entanglement in several physical processes but also we are able to verify that local realism can not describe quantum mechanics. We go a step further and suggest the possibility that maximal entanglement plays a... More »

There are two canonical approaches to treating the Standard Model as an effective field theory: the Standard Model EFT (SMEFT), respecting the full electroweak gauge symmetry, and the Higgs EFT (HEFT), respecting only electromagnetism. Of these, SMEFT has become the predominant framework for interpreting LHC Higgs data and exploring the systematics of effective field theory.... More »