Köln 2004 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 11: Poster Session: Electromagnetic and Hadronic Probes
HK 11.7: Poster
Tuesday, March 9, 2004, 13:30–15:30, Foyer
On the nature of the light scalar mesons — •Christoph Hanhart1, Johann Haidenbauer1, Vadim Baru1,2, Yulia Kalashnikova2, and Alexander Kudryavtsev2 — 1Institut für Kernphysik, Forschungszentrum Jülich GmbH, D–52425 Jülich, Germany — 2Institute of Theoretical and Experimental Physics, 117259, B. Cheremushkinskaya 25, Moscow, Russia
Almost since their discovery there is a heated debate in the physics community about what is the nature of the lightest scalar mesons, in particular the a0(980) and the f0(980). Some say, they are normal q q states, some say they are compact four quark states and some say they are of molecular type. Recently efforts increased to identify observables that might be decisive on model independent grounds to resolve this fundamental issue. In the poster our recent efforts in this direction are presented, based on the generalization of a formalism by S. Weinberg. The effective couplings of resonance states to the continuum were identified as the central quantities of the analysis. Some comments are made on why these quantities are so badly known for the a0 and the f0.