XVIII International Conference on Hadron Spectroscopy and Structure (HADRON2019)

e+e- -> gamma X(3872) cross section measurement

Not scheduled

15m

Guilin Bravo Hotel, Guilin, China

Poster Posters

Speaker

Hang Zhou (Shandong University)

Description

We study the process of e+e- ->gamma omega J/psi with 11.6 fb-1 e+e- annihilation data taken at center-of-mass energies from 4.008 GeV to 4.600 GeV with the BESIII detector at the BEPCII storage ring. X(3872)->omega J/psi is observed with more than 5 sigma significance for the first time. The X(3872) mass is measured to be 3873.3 +- 1.1+- 1.0 MeV. The ratio of the decay rate of X(3872)->omega J/psi to X(3872)->pipiJ/psi is measured to be 1.6+-0.4+- 0.2, which indicates a large iso-spin violation effect. The srqt(s) dependent cross section of is also investigated.