https://doi.org/10.1140/epja/i2006-10193-6
QNP 2006
Towards an understanding of the light scalar mesons
Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany
* e-mail: c.hanhart@fz-juelich.de
Received:
8
October
2006
Accepted:
15
October
2006
Published online:
23
February
2007
Although studied for many years the nature of the light scalar mesons remains controversial. Here we shall present a method, applicable for s-wave states located close to a threshold, that allows one to quantify the molecular part of a given state. When applied to the f 0(980) a dominance of the molecular component is found. In the second part, we show that requirements of field-theoretic consistency and chiral symmetry, when applied to the scattering of light pseudo-scalars, naturally lead to the appearance of dynamical poles in the scalar sector. A program is proposed on how to further investigate experimentally the mixing between these dynamical states and possible genuine quark states.
PACS: 13.60.Le Meson production – / 13.75.-n Hadron-induced low- and intermediate-energy reactions and scattering (energy 
– / 14.40.Cs Other mesons with S = C = 0, mass < 2.5 GeV –
© Società Italiana di Fisica and Springer-Verlag, 2007
