Abstract
We study the processes and in which an energetic photon is radiated from the initial state. The data were collected with the BABAR detector at the SLAC National Accelerator Laboratory. About 7300 and 870 events, respectively, are selected from a data sample corresponding to an integrated luminosity of . The invariant mass of the hadronic final state defines the effective center-of-mass energy. The center-of-mass energies range from threshold to 4.5 GeV. From the mass spectra, the first ever measurements of the and the cross sections are performed. The contributions from , , , and other intermediate states are presented. We observe the and in most of these final states and measure the corresponding branching fractions, many of them for the first time.
20 More- Received 4 October 2021
- Accepted 16 November 2021
DOI:https://doi.org/10.1103/PhysRevD.104.112004
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