The meson spectra beyond a $q\bar{q}$ description

Abstract

Despite the apparent simplicity of meson spectroscopy there are some states which cannot be accommodated in the usual $q\bar{q}$ structure. Among them there are either exotic states as the X(1600), or the recently measured charmed states $D_{sJ}^{\ast }$ and some of the light scalar mesons. We present a description of the light scalar mesons in terms of $q\bar{q}$ and $qq\bar{q}\bar{q}$ components.

Comments: 3 pages. Talk presented at the 19th European Few-Body conference, Groningen, The Netherlands, August 23-27, 2004