Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Hadron Structure and Spectroscopy VII

HK 33.5: Talk

Wednesday, April 1, 2020, 17:45–18:00, J-HS A

Inclusive charmonium mesons production above 4 GeV — •Simon Nakhoul^1,2, Klaus Götzen¹, Ralf Kliemt¹, Frank Nerling^1,2, and Klaus Peters^1,2 — ¹GSI Helmholtzzentrum für Schwerionenforschung — ²Goethe-Universität Frankfurt

Since 2003, the XYZ charmonium-like states have become a hot topic in the hadron spectroscopy field. The Beijing Spectrometer III (BESIII) at the Beijing Electron-Positron Collider II (BEPC II) is one of the leading experiments in the XYZ-related physics. It has brought us numerous breakthrough discoveries, e.g., the first observation of the Z_c(3900). In order to understand the nature of these intriguing states and their decay patterns, an inclusive analysis is performed using the recoil mass technique approach for different particles (π⁺π⁻, K⁺K⁻, π⁰π⁰...) at center of mass energies above 4 GeV. The aim of this analysis is to search for new unobserved Y(4260) decay channels and to provide accurate inclusive cross section measurements for e⁺e⁻ → X_cc + π⁺π⁻ (X_cc = J/ψ, h_c , ψ(2S)) then compare them to the corresponding exclusive BESIII measurements.