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Testing Chiral Dynamics in Pionic Atoms

E. Friedman·A. Gal
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Abstract

The energy dependence of chirally expanded pi N isoscalar and isovector amplitudes b_0(E) and b_1(E) respectively, for zero-momentum off shell pions near threshold, is used to impose the minimal substitution requirement E -> E - V_c on the properly constructed pion optical potential within a large-scale fit to 100 pionic-atom data across the periodic table which also include the recently established `deeply bound' pionic atoms of Pb and Sn. This fit cannot be reconciled with the well known free-space values of the pi N threshold amplitudes. In contrast, introducing the empirically known energy dependence for on-shell pions leads to a better fit and to satisfactory values for the pi N threshold amplitudes. The difference between these two approaches is briefly discussed.

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E. Friedman, A. Gal. 2003-10-09. Testing Chiral Dynamics in Pionic Atoms. https://doi.org/10.1016/j.physletb.2003.10.035

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