SMuK 2021 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 19: Hadron Structure and Spectroscopy IV
HK 19.2: Vortrag
Mittwoch, 1. September 2021, 17:00–17:15, H3
Search for couplings of vector charmonia to the ppη′ final state at BESIII — •Johannes Bloms1, Nienke Balz1, Helge Balzen1, Anja Brüggemann1, Christopher Fritzsch1, Titus Heinig1, Nils Hüsken2, Sascha Lennartz1, Frederik Weidner1, and Alfons Khoukaz1 for the BESIII collaboration — 1Westfälische Wilhelms-Universität, Münster, Germany — 2Indiana University, Bloomington, USA
The BESIII experiment at the Beijing Electron Positron Collider (BEPCII) has collected a large amount of high luminosity data sets at various center-of-mass energies between √s = 3.7 GeV and √s = 4.7 GeV, which offers a unique opportunity to study hadron spectroscopy and enables dedicated studies of exotic charmonia. The ψ(4230) with JPC = 1– and a mass around mψ(4230) = 4.23 GeV/c2 is one example for an exotic candidate. Many detailed investigations regarding the ψ(4230) have been made both experimentally and from theory, but there is still no consensus regarding its inner structure. Surprisingly, only a small coupling to open-charm final states has been found. Instead, the ψ(4230) is prominently observed in charmonium transitions like ψ(4230) → J/ψ π+ π−, ψ(4230) → hc π+ π− and ψ(4230) → ψ(2S) π+ π−. So far, no observations have been made of charmless decays of the ψ(4230) to light hadrons. In order to search for those possible decays of the ψ(4230), the final state ppη′ is investigated. The current status of the determination of the energy-dependent Born cross section σB(e+ e− → ppη′) will be presented and discussed. This work is funded by the DFG - 269952272, 271236083 and 443159800.