Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-11-05
PiN Newslett.15:197-200,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages. Talk given at ``8th International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon (MENU99)'', Zuo
Scientific paper
Using non relativistic effective Lagrangian techniques, we analyze the hadronic decay of the pi+pi- atom and the strong energy-level shift of pionic hydrogen in the ground state. We derive general formulae for the width and level shift, valid at next-to-leading order in isospin breaking. The result is expressed in terms of hadronic threshold amplitudes that include isospin-breaking effects. In order to extract isospin symmetric scattering lengths from the data, we invoke chiral perturbation theory, that allows one to relate the scattering lengths to the threshold amplitudes.
Gasser Juerg
Lyubovitskij Valery E.
Rusetsky Akaki
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