Verlag des Forschungszentrums Jülich
JUEL-3065
Janssen, Georg
Meson-Meson-Prozesse in der starken Wechselwirkung
123 S., 1995
Abstract
Based on the meson-exchange framework the present work investigates the role
played by meson-meson processes in strong interaction dynamics. 'vVe concentrate
on two particular topics, one representing the more fundamental aspects of mesonmeson
systems the other being an example for the many possible applications.
Using realistic meson-exchange models for 7r7r- and 7r1)-scattering the first part
of this work investigates the structure of the scalar meson 10(980) and ao(980) both
being of outstanding importance for our understanding of the scalar meson sector.
Our model produces good agreement with the available data. Furthermore, an
analysis of the pole structure of the underlying tt tt- and 7r1)-scattering amplitudes
leads to an understanding of the nature and parameters of 10(980) and ao(980). It
is shown that besides the observed relationship between 10(980) and ao(980) their
underlying structure is quite different.
The second part of our investigation deals with the role played by correlated
7rp exchange in the N N interaction. Starting point are open questions concerning
the structure of the 7rNN vertex function. In the Bonn potential of the N N
interaction a rather 'hard' 7rNN formfactor is required in order to be able to
reproduce experimental data, in particular the deuteron properties. However, this
result is in disagreement with predictions from several theoretical models requiring
a much softer 7rNN formfactor. We are able to show that this discrepancy is
removed if correlated 7rp exchange is added to the Bonn potential.
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