Towards an understanding of the light scalar mesons
Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany
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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