147 research outputs found
Ridge regression for minimizing the couplings of hyperon resonances in the photoproduction
We employed the isobar model for investigating the
photoproduction process. We paid special attention to the recent CLAS
polarization data and enhanced the minimization by adding a penalty
term. Without changing the set of included resonances used by the model, this
technique known as Ridge regression leads to reduced couplings that in previous
studies acquired unreasonably large values. As a result, we have arrived at a
much more robust model with hyperon couplings which are reduced to more
physical values. This model serves us to extract valuable information on the
background to the photoproduction and particularly on the role of
various hyperon resonances. The set of the nucleon resonances is the same with
respect to previous fits but their role may have changed due to different
couplings which they acquire in the present fit.Comment: 12 pages, 12 figures, 1 tabl
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