在$γp\ rightarrow k^+σ^0 $向前角和低动量传递的横截面中观察类似尖的结构

论文标题

在$γp\ rightarrow k^+σ^0 $向前角和低动量传递的横截面中观察类似尖的结构

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

论文作者

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

论文摘要

在BGOOD实验中测量了$γp\ rightarrow k^+σ^0 $差分横截面。在狭窄的能量范围内的强度下降，并且在1900年的质量中心能量中观察到了反应中$ k^+$的极角度的$ k^+$的极角度。居住在多个开放和隐藏的陌生阈值附近，该结构似乎与介子 - 巴里昂阈值效应一致，这可能有助于反应机理。

The $γp \rightarrow K^+Σ^0$ 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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