Hadronic Atoms in QCD
High Energy Physics - Phenomenology
2011-04-15 v1
Abstract
We propose a non relativistic effective Lagrangian approach to study hadronic atom observables in the framework of QCD (including photons). We apply our formalism to derive a general expression for the width of the pi+pi- atom decaying into two neutral pions. It contains all terms at leading and next-to-leading order in isospin breaking. The result allows one to evaluate the combination a0-a2 of pi-pi S-wave scattering lengths from pi+pi- atom lifetime measurements, like the one presently performed by the DIRAC expeiment at CERN.
Cite
@article{arxiv.hep-ph/9910524,
title = {Hadronic Atoms in QCD},
author = {J. Gasser and V. E. Lyubovitskij and A. Rusetsky},
journal= {arXiv preprint arXiv:hep-ph/9910524},
year = {2011}
}
Comments
5 pages. Talk given at ``8th International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon (MENU99)'', Zuoz, Switzerland, August 16-20, 1999