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Rare pionium decays and pion polarizability

  • H.-W. Hammer
  • J.N. Ng
Hadron physics

Abstract:

We calculate the decay of pionium atoms into two photons. The pion polarizabilities give rise to a 10% correction to the corresponding decay width for pointlike pions. This opens the possibility to obtain the difference between the electric and magnetic polarizability of the charged pion from a future measurement of the branching fraction of pionium into two photons. For such an experiment the ππ-scattering lengths would have to be known to better than 5% precision. We also comment on the contribution of the axial anomaly to the decay of pionium into γπ0.

PACS: 36.10.Gv Mesonic atoms and molecules, hyperonic atoms and molecules – 14.40.Aq π, K and η mesons – 13.40.-f Electromagnetic processes and properties 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • H.-W. Hammer
    • 1
  • J.N. Ng
    • 1
  1. 1.TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C., V6T 2A3 CanadaCA

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