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 | |
| Publication status | Published - 1999 |
Keywords
- Chiral perturbation theory
- Hadronic atoms
- Nonrelativistic effective Lagrangians
ASJC Scopus subject areas
- Nuclear and High Energy Physics
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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