Low lying $qqqq\overline{q}$ states in the baryon spectrum

The coupling to light mesons leads to large widths and shifts of the energy of the excited states in the baryon spectrum from the predictions of the constituent quark model with three valence quarks. This coupling may be modelled by admixtures of sea-quark $qqq(q\bar q)^n$ configurations in the resonances. Using the same schematic flavor and spin dependent interaction model, which reproduces the low lying part of the experimental baryon spectrum in the valence quark model, the lowest $qqqq\bar q$ states are shown to form nearly degenerate bands of positive and negative parity states, which overlap strongly with the low lying excited $qqq$ states in the P and SD shell