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Strong interaction level shifts and widths in Σ − atoms are analyzed by using a Σ nucleus optical potential constructed within the relativistic mean field approach. The analysis leads to potentials with a repulsive real part in the nuclear interior. The data are sufficient to establish the size of the isovector meson-hyperon coupling. Implications to Σ hypernuclei are discussed.

We erroneously discussed in the published manuscript, between Eqs. (4) and (5) and in the beginning of Sec. III B, an 'I = 0 isospin configuration' for an even number κ = 0 ofK mesons. Bose Einstein statistics imposes I = κ/2 when all these mesons are placed in the lowest mean-field s-state, as considered in this work. Therefore, the dashed lines corresponding to the 'I = 0 configuration' in Fig. 8 are to be