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26 April 2024

» arxiv » 2007.8896

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Strangeness Photoproduction at the BGO-OD experiment
T. C. Jude ; S. Alef ; P. Bauer ; R. Beck ; A. Braghieri ; P. L. Cole ; R. Di Salvo ; D. Elsner ; A. Fantini ; O. Freyermuth ; F. Ghio ; A. Gridnev ; D. Hammann ; J. Hannappel ; K. Kohl ; N. Kozlenko ; A. Lapik ; P. Levi Sandri ; V. Lisin ; G. Mandaglio ; R. Messi ; D. Moricciani ; V. Nedorezov ; D. Novinsky ; P. Pedroni ; A. Polonski ; B.-E. Reitz ; M. Romaniuk ; G. Scheluchin ; H. Schmieden ; V. Sumachev ; V. Tarakanov ; C. Tillmanns ;
Date:	17 Jul 2020
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)$ ightarrow K^+Sigma^0pi^0$, and a peak structure in $K^0_SSigma^0$ photoproduction. The peak in the $K^0_SSigma^0$ 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.
Source:	arXiv, 2007.8896
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