On the lifetime of the π+ π- atom

A. Gall, J. Gasser, V. E. Lyubovitskij, A. Rusetsky

    Research output: Contribution to journalArticlepeer-review

    49 Citations (Scopus)


    The π+ π- atom decays - in the ground state - predominantly into two neutral pions. We present a general expression for the corresponding decay width in the framework of QCD (including photons). It contains all terms at leading and next-to-leading order in isospin breaking. The result allows one to evaluate the combination |α0 - α2| of ππ S-wave scattering lengths from π+π- lifetime measurements, like the one presently performed by the DIRAC experiment at CERN.

    Original languageEnglish
    Pages (from-to)335-340
    Number of pages6
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Issue number3-4
    Publication statusPublished - 1999


    • Chiral perturbation theory
    • Hadronic atoms
    • Nonrelativistic effective Lagrangians

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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