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Rare pionium decays and pion polarizability

  • Hadron physics
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The European Physical Journal A - Hadrons and Nuclei Aims and scope Submit manuscript

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.

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Authors and Affiliations

  1. TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C., V6T 2A3 Canada, , , , , , CA

    H.-W. Hammer & J.N. Ng

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  1. H.-W. Hammer
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  2. J.N. Ng
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Received: 1 March 1999 / Revised version: 31 May 1999

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Hammer, HW., Ng, J. Rare pionium decays and pion polarizability . EPJ A 6, 115–118 (1999). https://doi.org/10.1007/s100500050324

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  • DOI: https://doi.org/10.1007/s100500050324

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