Speaker
Description
n this talk, four recent measurements of chi_cJ or psi decays at BESIII will be presented. In contains: 1) Using 448 million psi(3686) events collected with the BESIII detector, the process psi(2S) -> phi Ks Ks has been observed for the first time, and the branching fraction is determined; 2) Using the same data sample, 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; 3) Utilizing 2700 million psi(3686) events collected by the BESIII detector, the decays chi_cJ -> Omega+ anti-Omega- (J=0,1,2) have been observed for the first time with high significance, respectively, via the radiative decays of psi(3686) -> gamma chi_cJ. The relevant branching fractions have been provided. 4) 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.
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