Multi-reaction-channel fitting calculations in a coupled-channel model: Photoinduced strangeness production |
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Authors: | O Scholten and A Usov |
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Institution: | 1.Kernfysisch Versneller Institute,University of Groningen,Groningen,The Netherlands;2.University of Leiden,Leiden,The Netherlands |
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Abstract: | To describe photo- and meson-induced reactions on the nucleon, one is faced with a rather extensive coupled-channel problem.
Ignoring the effects of channel coupling, as one would do in describing a certain reaction at the tree level, invariably creates
a large inconsistency between the different reactions that are described. In addition, the imaginary parts of the amplitude,
which are related through the optical theorem, to total cross-sections, are directly reflected in certain polarization observables.
Performing a full coupled-channel calculation thus offers the possibility to implement the maximum number of constraints.
The drawback one is faced with is to arrive at a simultaneous fit of a large number of reaction channels. While some of the
parameters are common to many reactions, one is still faced with the challenge to optimize a large number of parameters in
a highly non-linear calculation. Here we show that such an approach is possible and present some results for photoinduced
strangeness production. |
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Keywords: | |
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