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

T. C. Jude; S. Alef; P. Bauer; D. Bayadilov; R. Beck; A. Bella; J. Bieling; A. Braghieri; P. L. Cole; D. Elsner; R. Di Salvo; A. Fantini; O. Freyermuth; F. Frommberger; F. Ghio; S. Goertz; A. Gridnev; D. Hammann; J. Hannappel; K. Kohl; N. Kozlenko; A. Lapik P. Levi Sandri; V. Lisin; G. Mandaglio; F. Messi; R. Messi; D. Moricciani; V. Nedorezov; V. A Nikonov; D. Novinskiy; P. Pedroni; A. Polonskiy; B. -E. Reitz; M. Romaniuk; A. V Sarantsev; G. Scheluchin; H. Schmieden; A. Stugelev; V. Sumachev; V. Vegna; V. Tarakanov; T. Zimmermann

doi:10.1016/j.physletb.2021.136559

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arXiv · 2006.12437

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

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Abstract

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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T. C. Jude, S. Alef, P. Bauer, D. Bayadilov, R. Beck, A. Bella, J. Bieling, A. Braghieri, P. L. Cole, D. Elsner, R. Di Salvo, A. Fantini, O. Freyermuth, F. Frommberger, F. Ghio, S. Goertz, A. Gridnev, D. Hammann, J. Hannappel, K. Kohl, N. Kozlenko, A. Lapik P. Levi Sandri, V. Lisin, G. Mandaglio, F. Messi, R. Messi, D. Moricciani, V. Nedorezov, V. A Nikonov, D. Novinskiy, P. Pedroni, A. Polonskiy, B. -E. Reitz, M. Romaniuk, A. V Sarantsev, G. Scheluchin, H. Schmieden, A. Stugelev, V. Sumachev, V. Vegna, V. Tarakanov, T. Zimmermann. 2020-06-22. Observation of a cusp-like structure in the $\gamma p \rightarrow K^+\Sigma^0$ cross section at forward angles and low momentum transfer. https://doi.org/10.1016/j.physletb.2021.136559

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