Speaker
Description
The light-front wavefunctions of hadrons allows us to calculate a wide range of physical observables; however, the wave-functions themselves cannot be measured. Furthermore, the light-front wavefunctions are typically expanded in their Fock components, and it is not clear, a priori, how many terms in this expansion are needed for quantitatively reliable calculations of hadron observables, and for restoration of rotational invariance. I will discuss recent approaches to calculate light-front wavefunctions of quarkonium and positronium which form ideal systems to investigate these questions. I will also discuss the prospects of extracting light-front observables such as distribution amplitudes and PDFs, and possibly even the light-front wavefunction, from other methods such as the explicitly covariant Bethe-Salpeter equation in ladder truncation, or from lattice QCD.
