T. Mart — Page 6 | Searcharxiv

arXiv1996

Electromagnetic Production of Kaons on the Nucleon

Kaon photo- and electroproduction in all six isospin channels are investigated by means of an isobaric model. It is found that existing models can only partially describe the current experimental data. Moreover, the extracted coupling constants are mostly inconsistent with the prediction of SU(3) symmetry or the information from hadronic reactions. In order to further analyze this problem, we introduce a form factor at the hadronic vertices $KNY$ (with $Y=Λ~ \textrm{or}~ Σ$) and study its behavior qualitatively. Our result suggests the need of more accurate experiments, especially in the charged $Σ$ and the neutral $K^0$ channels.

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arXiv1995

Constraints on Coupling Constants through Charged $Σ$ Photoproduction

The few available data for the reactions $γp \rightarrow K^{0} Σ^{+}$ and $γn \rightarrow K^{+} Σ^{-}$ are compared to models developed for the processes $γp \rightarrow K^{+} Σ^{0}$ and $γp \rightarrow K^{+} Λ$. It is found that some of these phenomenological models overpredict the measurements by up to a factor of 100. Fitting the data for all of these reactions leads to drastically reduced Born coupling constants.

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