Jun 5 – 9, 2023
Genova, Italy
Europe/Rome timezone

Measurements of charmonium decays from BESIII

Jun 6, 2023, 2:24 PM
DAD - Room 5H (Genova, Italy)

DAD - Room 5H

Genova, Italy

Contributed Hadron decays, production and interactions Hadron decays, production and interaction


Giulio Mezzadri (Istituto Nazionale di Fisica Nucleare)


This presentation will cover the branching fraction measurements of chi_cJ -> phi phi (J=0,1,2), eta_c(2S) -> pi+ pi- eta, chi_cJ -> Omega+ antiOmega- (J=0,1,2), and psi(3770) -> eta J/psi. The first three measurements are benefitted from the huge psi(2S) samples collected at BESIII and the transitions from psi(2S) to chi_cJ or eta_c(2S). The last one is based on e+ e- annihilation data sample collected at c.m.s 3.773 GeV. The branching fractions of the decays chi_cJ -> phi phi (J=0,1,2) have been measured most precisely, and the polarization parameters of chi_cJ -> phi phi have been determined for the first time via a helicity amplitude analysis. The evidence of eta_c(2S) -> pi+ pi- eta has been found in the decay sequence psi(3686) -> gamma eta_c(2S), eta_c(2S) -> pi+ pi- eta for the first time.The decays chi_cJ -> Omega+ anti-Omega- (J=0,1,2) have been observed for the first time with high significance, respectively, and the relevant branching fractions have been provided.The process e+ e- -> eta J/psi at a center-of-mass energy 3.773 GeV is observed for the first time, its Born cross-section is measured, and the branching fraction of psi(3770) -> eta J/psi is determined by a combined fit with the cross-sections at other energy points, after considering the interference effect for the first time.

Primary authors

Beijiang Liu (Institute of High Energy Physics) Giulio Mezzadri (Istituto Nazionale di Fisica Nucleare)

Presentation materials