Polyelectrons and exotic atoms

par Andrzej Czarnekj (LAPP Annecy-le-Vieux)

vendredi 3 juil. 2009, 14:00 → 15:00 Europe/Paris

Auditorium

Polyelectrons are bound states of a few electrons and positrons. The simplest example is positronium. Its negative ion (two electrons and a positron), as well as a four-body dipositronium molecule have also been discovered and are subject of ongoing experiments. Among their goals is the creation of larger polyelectrons to study the Bose-Einstein condensation of positronia and a gamma ray laser based on stimulated annihilation. In this talk I will review effective field theory methods used to determine precise properties of three- and four-body polyelectrons. I will also show other examples of how exotic atoms provide information about fundamental interactions, and how methods originating in high-energy theory help determine their properties.