Anomaly in the K^0_S Sigma^+ photoproduction cross section off the proton at the K* threshold

Abstract

The $\gamma +p\to K^0+{\Sigma }^{+}$ photoproduction reaction is investigated in the energy region from threshold to $E_{\gamma }=2250$\,MeV. The differential cross section exhibits increasing forward-peaking with energy, but only up to the $K^{\ast }$ threshold. Beyond, it suddenly returns to a flat distribution with the forward cross section dropping by a factor of four. In the total cross section a pronounced structure is observed between the $K^{\ast }\Lambda$ and $K^{\ast }\Sigma$ thresholds. It is speculated whether this signals the turnover of the reaction mechanism from t-channel exchange below the $K^{\ast }$ production threshold to an s-channel mechanism associated with the formation of a dynamically generated $K^{\ast }$-hyperon intermediate state.

arXiv comment14 pages, 7 figures

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• Light Baryon Spectroscopy
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• Measurement of the g p -> K^0 Sigma^+ reaction with the Crystal Ball/TAPS detectors at the Mainz Microtron
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• Photoproduction of $\Lambda$ and ${\Sigma }^0$ hyperons off protons with linearly polarized photons at $E_{\gamma }=1.5-3.0$ GeV
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• Strangeness photoproduction at extremely forward angles at the BGO-OD experiment
• Recent Developments on Hadron Interaction and Dynamically Generated Resonances