On the lifetime of the π+ π- atom

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

    Research output: Contribution to journalArticle

    52 Citations (Scopus)

    Abstract

    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
    Volume462
    Issue number3-4
    DOIs
    Publication statusPublished - 1999

    Fingerprint

    life (durability)
    decay
    wave scattering
    S waves
    atoms
    pions
    quantum chromodynamics
    ground state
    photons

    Keywords

    • Chiral perturbation theory
    • Hadronic atoms
    • Nonrelativistic effective Lagrangians

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    On the lifetime of the π+ π- atom. / Gall, A.; Gasser, J.; Lyubovitskij, V. E.; Rusetsky, A.

    In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 462, No. 3-4, 1999, p. 335-340.

    Research output: Contribution to journalArticle

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