Abstract
We construct an effective non-relativistic quantum field theory that describes bound states of π+π- pairs and their hadronic decays. We then derive a general expression for the lifetime of the ground state at next-toleading order in isospin breaking. Chiral perturbation theory allows one to relate the decay rate to the two S-wave ππ scattering lengths and to several low-energy constants that occur in the chiral Lagrangian. Recent predictions for the scattering lengths give τ=(2.9±0.1)×10-15 s. This result may be confronted with π+π- lifetime measurements, like the one presently carried out at CERN.
Original language | English |
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Article number | 016008 |
Journal | Physical Review D |
Volume | 64 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2001 |
Externally published | Yes |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)