학술논문
Strangeness Photoproduction at the BGO-OD experiment
Document Type
Working Paper
Author
Jude, T. C.; Alef, S.; Bauer, P.; Beck, R.; Braghieri, A.; Cole, P. L.; Di Salvo, R.; Elsner, D.; Fantini, A.; Freyermuth, O.; Ghio, F.; Gridnev, A.; Hammann, D.; Hannappel, J.; Kohl, K.; Kozlenko, N.; Lapik, A.; Sandri, P. Levi; Lisin, V.; Mandaglio, G.; Messi, R.; Moricciani, D.; Nedorezov, V.; Novinsky, D.; Pedroni, P.; Polonski, A.; Reitz, B. -E.; Romaniuk, M.; Scheluchin, G.; Schmieden, H.; Sumachev, V.; Tarakanov, V.; Tillmanns, C.
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Subject
Language
Abstract
The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating low momentum transfer processes due to the acceptance and high momentum resolution at forward angles. In particular, this enables the investigation of strangeness photoproduction where t-channel exchange mechanisms play an important role. This also allows access to low momentum exchange kinematics where extended, molecular structure may manifest in reaction mechanisms. First key results at low $t$ indicate a cusp-like structure in $K^+\Sigma^0$ photoproduction at $W = 1900$\,MeV, line shapes and differential cross sections for $K^+\Lambda$(1405)$\rightarrow K^+\Sigma^0\pi^0$, and a peak structure in $K^0_S\Sigma^0$ photoproduction. The peak in the $K^0_S\Sigma^0$ channel appears consistent with meson-baryon generated states, where equivalent models have been used to describe the $P_C$ pentaquark candidates in the heavy charmed quark sector.
Comment: Proceedings of The 12th International Workshop on the Physics of Excited Nucleons (NSTAR 2019)
Comment: Proceedings of The 12th International Workshop on the Physics of Excited Nucleons (NSTAR 2019)