17–21 Jul 2023
Hörsaalzentrum Unteres Schloss
Europe/Berlin timezone

Studies of chi_cJ and psi decays at BESIII

20 Jul 2023, 14:20
20m
US-C 105 (Hörsaalzentrum Unteres Schloss)

US-C 105

Hörsaalzentrum Unteres Schloss

US-C, Kölner Str. 41, 57072 Siegen
contributed parallel talk spectroscopy Parallel B

Speaker

Zhiyong Wang

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.

Consent I consent to recording/broadcasting my presentation.

Primary author

Co-author

Beijiang Liu (Institute of High Energy Physics)

Presentation materials