Bonn 2020 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 33: Hadron Structure and Spectroscopy VII
HK 33.6: Talk
Wednesday, April 1, 2020, 18:00–18:15, J-HS A
Inclusive analysis of the Y(4260) with baryonic recoil at the BESIII/BEPCII experiment — •Mathilde Himmelreich1, Klaus Götzen3, Ralf Kliemt2,3, Frank Nerling1,3, Simon Nakhoul1,3, and Klaus Peters1,3 — 1Goethe Universität Frankfurt — 2Helmholtzinstitut Mainz — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt
The BESIII experiment is operating since 2008 and is well suited for charmonium spectroscopy.Besides the conventional charmonium states, many unexpected charmonium-like states with exotic properties, the so-called XYZ states, have been discovered. The nature of these states is still unclear, they are not in agreement with the theoretical expectations. The vector charmonium-like state Y(4260) has been discussed to be a hybrid or a tetraquark state. Precise cross section measurements of the hidden-charm final states of the Y(4260) in the BESIII data resolve meanwhile two resonance structures, the Y(4220) and the Y(4390). Additional studies of open-strange final states such as ΛΛ and ΣΣ will help to clarify the nature of these two vector states.