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Decays of the pi+ pi- atom | | J. Gasser
; V. E. Lyubovitskij
; A. Rusetsky
; A. Gall
; | | Date: |
14 Mar 2001 | | Journal: | Phys.Rev. D64 (2001) 016008 | | Subject: | hep-ph | | Affiliation: | Bern University), V. E. Lyubovitskij (Tuebingen University and Tomsk University), A. Rusetsky (Bern University and Tbilisi University), A. Gall (SWITCH | | Abstract: | We construct an effective non-relativistic quantum field theory that describes bound states of pi+ pi- pairs and their hadronic decays. We then derive a general expression for the lifetime of the ground state at next-to-leading order in isospin breaking. Chiral perturbation theory allows one to relate the decay rate to the two S-wave pi pi scattering lengths and to several low-energy constants that occur in the chiral Lagrangian. Recent predictions for the scattering lengths give tau = (2.9 pm 0.1) * 10^{-15} sec. This result may be confronted with pi+ pi- lifetime measurements, like the one presently carried out at CERN. | | Source: | arXiv, hep-ph/0103157 | | Services: | Forum | Review | PDF | Favorites | |
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