Decays of the pi+ pi- atom
| dc.creator | Gasser, J. | |
| dc.creator | Lyubovitskij, V. E. | |
| dc.creator | Rusetsky, A. | |
| dc.creator | Gall, A. | |
| dc.date | 2001-03-14 | |
| dc.date.accessioned | 2026-07-07T10:52:18Z | |
| dc.date.available | 2026-07-07T10:52:18Z | |
| dc.description | 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. | |
| dc.description | 41 pages, 8 postscript figures, uses REVTEX style | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0103157 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0103157 | |
| dc.identifier | Phys.Rev.D64:016008,2001 | |
| dc.identifier | doi:10.1103/PhysRevD.64.016008 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/185115 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Decays of the pi+ pi- atom | |
| dc.type | text |