Towards an understanding of the light scalar mesons

Details Towards an understanding of the light scalar mesons Towards an understanding of the light scalar mesons

2006-09-14

arxiv.org/abs/hep-ph/0609136v1

Eur.Phys.J.A31:543-548,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages; invited talk at the IVth International Conference on Quarks and Nuclear Physics (QNP06), Madrid, June 5th-10th 2006

Scientific paper

10.1140/epja/i2006-10193-6

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.

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