Abstract
We report the first observation of the processes at , with significance exceeding for both processes. The measured Born cross sections are , and . We also set the upper limit on the cross section of the process to be at 90% C.L. The results are obtained with the data sample collected with the Belle detector at the KEKB asymmetric-energy collider in the energy range from 10.63 to 11.02 GeV.
- Received 11 August 2021
- Accepted 12 November 2021
DOI:https://doi.org/10.1103/PhysRevD.104.112006
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Published by the American Physical Society