Observation of a cusp-like structure in the γp → K+Σ0 cross section at forward angles and low momentum transfer
oleh: 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. Stuglev, V. Sumachev, V. Vegna, V. Tarakanov, T. Zimmermann
| Format: | Article |
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| Diterbitkan: | Elsevier 2021-09-01 |
Deskripsi
The γp→K+Σ0 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.