Abstract
We discuss the light meson spectrum, with special emphasis on hadronic mass shifts related to thresholds. In particular we discuss the puzzle of the scalar mesons a 0(980), a 0/S(1322) and ƒ 0(975) and comment on the K ∗(1410) and the K ∗(1680) . We also emphasize that, as data have improved, the fine-splitting of light qq̄ resonances well above the first threshold seems to be systematically smaller than previous model estimates. This suggests that hadronic self-energy mass shifts are at least as important as the one-gluon exchange in understanding the spectrum. Apart from providing a possible resolution to the puzzle of the light scalars one can then also within the pseudoscalar sector understand better the dual role of the pion as both a Nambu-Goldstone boson and a 1S 0 q q ̄ state.
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