Physics – Atomic Physics
Scientific paper
2000-03-02
J. Phys. B: At. Mol. Opt. Phys. 33 (2000) 3583-3604
Physics
Atomic Physics
Journal of Physics B: Atomic, Molecular and Optical Physics; (accepted; 22 pages, 6 figures, 26 references) Revised version: m
Scientific paper
10.1088/0953-4075/33/18/308
The experimental determination of the lifetime of pionium provides a very important test on chiral perturbation theory. This quantity is determined in the DIRAC experiment at CERN. In the analysis of this experiment, the breakup probabilities of of pionium in matter are needed to high accuracy as a theoretical input. We study in detail the influence of the target electrons. They contribute through screening and incoherent effects. We use Dirac-Hartree- Fock-Slater wavefunctions in order to determine the corresponding form factors. We find that the inner-shell electrons contribute less than the weakly bound outer electrons. Furthermore, we establish a more rigorous estimate for the magnitude of the contributions form the transverse current (magnetic terms thus far neglected in the calculations).
Baur Gerhard
Heim T. A.
Hencken Kai
Trautmann Dirk
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