Observation of a cusp-like structure in the $\gamma p\to K^{+}{\Sigma }^0$ cross section at forward angles and low momentum transfer

Abstract

The $\gamma p\to K^{+}{\Sigma }^0$ differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in energy and a strong dependence on the polar angle of the $K^{+}$ in the centre-of-mass of the reaction is observed at a centre-of-mass energy of 1900\,MeV. Residing close to multiple open and hidden strangeness thresholds, the structure appears consistent with meson-baryon threshold effects which may contribute to the reaction mechanism.

9 pages (including a 2 page appendix of tabulated data), 10 figures

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Cited by in corpus (2)

• Light baryon resonances from a coupled-channel study including $\mathbf{K\Sigma }$ photoproduction
• Beam-Recoil Transferred Polarization in $K^{+}Y$ Electroproduction in the Nucleon Resonance Region with CLAS12