MERCREDI 23 FEVRIER 2005 16 heures Salle Séminaire 5 Centre de Physique Théorique Marseille-Luminy Simeon Vugalter Mathematisches Institut, LMU München Title: Binding energy for Hydrogen in the Pauli-Fierz model Abstract: For the Pauli-Fierz operator with a short range potential we study the binding threshold as a function of the fine structure constant \alpha and show that it converges to the binding threshold for the Schrödinger operator in the small \alpha limit.