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Observation of a cusp-like structure in the γ p rightarrow K^+Sigma⁰ cross section at forward angles and low momentum transfer
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Observation of a cusp-like structure in the γ p rightarrow K^+Sigma⁰ cross section at forward angles and low momentum transfer
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The $\gamma p \rightarrow K^+\Sigma^0$ 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.
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