Investigation of $K^0\Sigma^+$ photoproduction with the CBELSA/TAPS experiment

TL;DR

This paper reports on the measurement of the $ ext{p}( ext{γ},K^0) ext{Σ}^+$ cross section at the CBELSA/TAPS experiment, revealing a cusp-like structure near the $K^*$ threshold and discussing potential underlying mechanisms.

Contribution

It provides new experimental data on $K^0 ext{Σ}^+$ photoproduction and explores the role of $K^*$ exchange and meson-hyperon states, introducing the BGO-OD experiment for further studies.

Findings

Observed a cusp-like structure near the $K^*$ threshold.

Cross section reduced by a factor of four in the forward direction.

Discussed potential contributions of $K^*$ exchange and meson-hyperon states.

Abstract

$\gamma (p,K^0)\Sigma^+$ cross section was measured at the CBELSA/TAPS experiment at the ELSA electron stretcher facility. A cusp-like structure was apparent near the $K^*$ production threshold, where the cross section reduced by a factor of four in the forward direction. It is speculated that t-channel $K^*$ exchange, and meson-hyperon dynamically generated states may have large contributions to the cross section. The motivation for the extraction of the beam-target double polarisation observable, $E$, is discussed, and the new experiment, BGO-OD at the ELSA facility is introduced.