  The analysis of the poles of the $\pi\pi$ scattering amplitude is shown to
favour a dynamical origin of the sigma meson: it is created by a strongly
attractive $\pi\pi$ interaction in the $J^{PC}=0^{++}I=0$ channel. In the limit
$N_c\to\infty$, the $\sigma$ meson disappears, contrary to the case of
conventional $q\bar{q}$ states. Implications for the search of the scalar
$q\bar{q}$ and glueball states are discussed.
