Abstract
We report searches for the processes and (, 2) based on data samples collected by the Belle experiment at the KEKB collider. We report the first observation of the process and first evidence for in the vicinity of the resonance, with center-of-mass energies from 10.96 to 11.05 GeV. The significances for and are greater than and , respectively. We also investigate the energy dependence of the cross section, but we cannot determine whether the contributions are from the and resonances or nonresonant continuum processes. The signals for are not significant, and the upper limits of the Born cross sections at the 90% confidence level are 0.7 and 1.0 pb for and , respectively, for center-of-mass energies from 10.96 to 11.05 GeV.
- Received 18 June 2018
DOI:https://doi.org/10.1103/PhysRevD.98.091102
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