Trajectories and Particle Creation and Annihilation in Quantum Field   Theory
  We develop a theory based on Bohmian mechanics in which particle world lines can begin and end. Such a theory provides a realist description of creation and annihilation events and thus a further step towards a "beable-based" formulation of quantum field theory, as opposed to the usual "observable-based" formulation which is plagued by the conceptual difficulties--like the measurement problem--of quantum mechanics. 
Detlef Duerr, Sheldon Goldstein, Roderich Tumulka, Nino Zanghi