Verlag des Forschungszentrums Jülich
JUEL-3476 Based on well established models for nucleon--nucleon and pion--nucleon scattering the
a modell for pion production in proton proton collisions is presented. The [Delta] (1232)
degree of freedom is explicitly taken into account. For the first time all possible final
states (pp to pp[pi]o, pp to d[pi]+ and pp to pn[pi]+)
are investigated simultanously. We obtain an overall satisfactory agreement with available
data on total cross sections as well as polarization observables from pion production
threshold up to the Delta resonance region. We discuss the effect of the delta isobar and
the sensitivity to off--shell properties of the [pi]N amplitude. The need for using a
microscopic model to treat the [pi]N subsystem is pointed out. The results are compared to
those obtained in tree level chiral perturbation theory. Possible sources of the
differences are discussed.
Hanhart, Christoph
Pion-Produktion in Proton-Proton-Stößen
159 S., 1997
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