Speaker
Description
This presentation will explore recent experimental findings in the domain of charmonium decays, encompassing four independent measurements conducted at BESIII. 1) Utilizing 27B psi(3686) events collected with the BESIII detector, various hc decays have been sought and measured. The decay channel hc -> 3(pi+pi-)pi0 has been observed for the first time, with strong evidence of hc -> 2(pi+ pi-)pi0 eta and 2(pi+ pi-)omega. 2) The observation of the psi(3686) -> 3phi. This observation illuminates the rare decay process of the psi(3686) resonance into three phi mesons, providing valuable insights into the dynamics of charmonium decays. No significant structure is observed in the phi phi invariant mass. 3) The search for eta_c(2S) -> pi+ pi- eta_c and eta_c(2S) -> pi+ pi- Ks0 K+/- pi-/+ decays. This study aims to explore the decay properties of the eta_c(2S) meson, offering new perspectives on its decay modes and contributing to our understanding of charmonium states. 4) The observation of chi_cJ -> 3(K+ K-). All the decays from chi_c0, chi_c1, and chi_c2 are observed for the first time.