Lattice QCD is delivering crucial input for precision observables that are used to test the Standard Model at low energies – see the FLAG review and the Muon g-2 Theory Initiative White Paper. The precision required on the hadronic contribution to these observables represents a significant challenge for lattice QCD and leads to large costs in computing time. The hadronic contributions are often computed as weighted integrals over Euclidean correlation functions, where the statistical noise at long distances can spoil the precision of the calculation. In other cases, specific hadronic matrix elements are needed, again requiring sufficiently large Euclidean time separations between the interpolating operators in order to suppress contamination by excited states.

In this CERN Theory Institute, we will bring together experts on reducing the statistical noise on lattice QCD correlation functions that might not often come together for focussed discussions on this topic because they work on rather different physics observables (e.g. flavour physics observables vs. the muon (g-2) vs. nucleon matrix elements). The goal is to review the state-of-the-art and most promising ideas across lattice QCD to make progress towards more efficient estimators of correlation functions.

This Theory Institute is supported by the CERN Theory Department and Next Generation Triggers (NGT).

Confirmed Speakers:

Lorenzo Barca (DESY)
Jacob Finkenrath (U. Wuppertal)
Leonardo Giusti (U. Milano Bicocca)
Jeremy Green (DESY)
Tim Harris (ETH Zürich)
Christoph Lehner (U. Regensburg)
Dimitra Pefkou (UC Berkeley)
Phiala Shanahan (MIT)