SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 57: Hadron Structure and Spectroscopy VI
HK 57.3: Vortrag
Donnerstag, 23. März 2023, 14:45–15:00, SCH/A316
Study of the Δ++ baryon at BESIII — •Dong Liu1,2, Christoph Rosner1, and Frank Maas1,3,4 for the BESIII collaboration — 1Helmholtz Institute Mainz, Mainz, Germany — 2University of Science and Technology of China, Hefei, China — 3Institute of Nuclear Physics, Mainz, Germany — 4PRISMA+ Cluster of Excellence, Mainz, Germany
The common baryons are the baryon octet and the baryon decuplet states. The wave functions of baryons in the octet are antisymmetric under quark exchange, and they have been extensively studied in electron-positron collision experiments, including proton, neutron, Λ, Σ, Ξ, etc. The wave functions of decuplet baryons are symmetric under quark exchange and there are few studies on them, including Δ, Σ*, Ξ*, Ω, etc. Among them, Δ particles are the lightest ones and have the highest cross section in electron-positron collisions. The measurement of the Δ production cross section at the BESIII experiment is a complement to the study of baryons and provides an experimental basis for theoretical studies of the intrinsic structure of baryons. The analysis of the Δ++ baryon pair production process is carried out at the BESIII experiment, giving the upper limit of the cross section for the process in the energy range from the threshold up to 2.645 GeV, which constrain the theoretical prediction for the decuplet pair production process. Meanwhile, the cross section and error for the Δ++p-π- process at a centre-of-mass energy of 2.645 GeV is also reported.