Abstract
We search for the and processes at a center-of-mass energy of 10.745 GeV, which is close to the peak of the state. We use data collected by the Belle II experiment during a special run, corresponding to an integrated luminosity of . We reconstruct decays and use the meson’s recoil mass to search for the signals. We do not find evidence for either process, and set upper limits on the corresponding Born-level cross sections of 2.5 pb and 7.8 pb, respectively, at the 90% confidence level. The limit is the result of a combination of this analysis and a previous search using full reconstruction.
- Received 21 December 2023
- Accepted 7 March 2024
DOI:https://doi.org/10.1103/PhysRevD.109.072013
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