Speaker
Description
The positronium is arguably the simplest bound state in QED. It is often used as a model for studying the structure of hadrons. In this talk, I will report our recent progress in solving the structure of the positronium from the light-front QED Hamiltonian in a basis approach. We include one dynamic photon in the basis. We perform the nonperturbative mass renormalization on the level of the constituent electron and positron. The basis regulators are determined by exploiting the rotational symmetry of the positronium system. I will compare the obtained low-lying mass spectra with those from nonrelativistic quantum mechanics. Finally, I will present the distribution of the electron and the photon in the positronium in momentum and coordinate space.
