Our research

Effective Quantum Field Theories (EFTs) are the state-of-the-art tools for analyzing physical systems that contain many different energy or momentum scales. Such systems are the rule, rather than the exception, from the "high"-energy domain of Particle Physics to the "low"-energy domain of Nuclear Physics.

At T30f we study Effective Field Theories and Renormalization Techniques with applications in Particle Physics and Hadronic Physics. Our present research involves topics and projects on the following topics:

Quarkonium Physics: production and decay

Heavy quarkonium is the ideal system to study the multiple energy scales of QCD. At high energies it can be studied through perturbative expansions in the strong coupling constant, while at low energies lattice calculations are needed. In the T30f we develop and apply EFTs for the study of these bound systems exploiting the non-relativistic nature of the system.

Collider physics and precise extraction of SM parameters

A very precise determination of Standard Model parameters is relevant for flavor physics and the search for physics beyond the Standard Model. Heavy quark bound states may be used to extract precise determinations of some of the Standard Model parameters like the heavy quark masses and the strong coupling constant alphas.

Exotic States

In the last decade many new unexpected states have been found in the Quarkonium spectrum close or above open flavor thresholds. The states that do not fit our standard expectations either in terms of quantum numbers or in terms of widths, decay or production behaviour are called exotics. This states are candidates for non traditional hadronic states, like tetraquark, molecules or hybrids, we study these states with Effective Field theories of QCD.

QCD at finite temperature

QCD at finite temperature displays a transition from a confining to a deconfined regime. The resulting new state of matter, the so-called quark-gluon-plasma, has been observed at colliders in heavy ion collisions. We study its phenomena through EFTs and lattice QCD.

Cosmology and Dark matter

Particle production rate at finite temperature and density are a key ingredient for the physics of the Early Universe. Inflation, Baryon Asymmetry generation and Dark Matter production probably occurred in a hot and dense plasma. In our group we develop resummation techniques to quantitatively address those phenomena exploiting EFTs.

Lattice calculations

Lattice QCD is a numerical method for non-perturbative calculations of the strong interactions using high-performance computing. It provides non-perturbative input that is required for effective field theories (EFTs) and needs EFTs for control of its systematical errors. Our research focus is on synergies between both methods.

Tools for higher order perturbative calculations in the Standard Model and EFTs

High-accuracy predictions for physical observables often require evaluation of complicated loop diagrams. One of the publicly available software tools to automatize such lengthy computations is FeynCalc. At the T30f we contribute to the development of this useful package.

Confinement strings and general properties of EFTs

The low energy region of QCD can be studied with effective field theory descriptions of the QCD vacuum structure. At T30f we are interested in studying and realizing descriptions for the QCD strings and the QCD dual superconductor hypothesis. We also study the symmetries of EFTs since they can be used to limit the number of independent Wilson coefficients of the theory reducing the number of matching calculations required to fully determine the EFT Lagrangian.