Abstract
Using a data sample of pairs collected on the resonance with the Belle detector at the KEKB asymmetric energy collider, we report the observation of and the first observation of . We measure a decay branching fraction of in for with a significance of 5.5 standard deviations. The contribution from is excluded. We measure a decay branching fraction of for with with a significance of 5.4 standard deviations. We study the difference of the distributions in and .
- Received 13 December 2019
- Accepted 2 March 2020
DOI:https://doi.org/10.1103/PhysRevD.101.052012
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society