On the lifetime of the π+ π- atom

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

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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 language	English
Pages (from-to)	335-340
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	462
Issue number	3-4
DOIs	https://doi.org/10.1016/S0370-2693(99)00918-1
Publication status	Published - 1999

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Keywords

Chiral perturbation theory
Hadronic atoms
Nonrelativistic effective Lagrangians

ASJC Scopus subject areas

Nuclear and High Energy Physics

Cite this

Gall, A., Gasser, J., Lyubovitskij, V. E., & Rusetsky, A. (1999). On the lifetime of the π+ π- atom. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 462(3-4), 335-340. https://doi.org/10.1016/S0370-2693(99)00918-1

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AB - 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.

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Access to Document

10.1016/S0370-2693(99)00918-1