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- W2049910113 abstract "Abstract We show how experimental values of the lifetime of the 1 s level of pionium and of the difference between the energies of the 2 s and 2 p levels yield values of the elements a oc and a cc respectively of the s -wave scattering matrix for the two-channel ( π + π − , π 0 π 0 ) system at the π + π − threshold. We then develop a method, using energy independent hadronic potentials which reproduce the best available pion-pion phase shifts up to 500 MeV total energy in the c.m. frame, for obtaining the values of the isospin invariant quantities a 0 2 − a 0 0 and 2 a 0 0 + a 0 2 from a oc and a cc respectively. We emphasize that the isospin invariant scattering lengths a 0 2 and a 0 2 universally used in the literature cannot be considered to be purely hadronic quantities." @default.
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- W2049910113 date "1998-01-01" @default.
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- W2049910113 title "The extraction of hadronic parameters from experiments on pionium" @default.
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- W2049910113 doi "https://doi.org/10.1016/s0375-9474(97)00645-3" @default.
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