Excitation cross sections for pionium in the Glauber approximation

M Schumann, T Heim, K Hencken, D Trautmann, G Baur
2002 Journal of Physics B: Atomic, Molecular and Optical Physics  
The experiment DIRAC at CERN aims to measure the lifetime of relativistic π + π − atoms (pionium) with an accuracy of 10%, requiring cross sections for the interaction of pionium with the target material with an accuracy of 1% as theoretical input. We calculate the excitation cross sections for the Coulomb interaction with the target atoms in the Glauber approximation which takes into account all multi-photon exchange processes. We find that they decrease the excitation cross sections,
more » ... d to first order in the Born approximation, by more than 2-15% for target materials with increasing Z and all initial states, much worse than the desired accuracy of 1%.
doi:10.1088/0953-4075/35/12/304 fatcat:c42talekmnbabcviuwcrasmvsi