Decay widths and energy shifts of pi pi and pi K atoms

Abstract

We calculate the S-wave decay widths and energy shifts for pi pi and pi K atoms in the framework of QCD+QED. The evaluation - valid at next-to-leading order in isospin symmetry breaking - is performed within a non-relativistic effective field theory. The results are of interest for future hadronic atom experiments.

Comments: Version to be published in Phys. Lett. B. Four references added, correlation matrix for pi K scattering lengths updated, uncertainty of Delta E^h_1 in table 2 adapted. 14 pages, 1 figure