Abstract
The process is observed for the first time with a statistical significance of at center-of-mass energy and at using data samples collected with the BESIII detector. The Born cross sections are measured to be and at and 4.258 GeV, respectively, where the first errors are statistical and the second systematic. Upper limits at the 90% confidence level of the Born cross sections are also reported at other 12 energy points.
- Received 12 May 2016
DOI:https://doi.org/10.1103/PhysRevD.94.032009
© 2016 American Physical Society