Abstract
We report the first observations of the spin-singlet bottomonium states and . The states are produced in the reaction using a data sample collected at energies near the resonance with the Belle detector at the KEKB asymmetric-energy collider. We determine and , which correspond to -wave hyperfine splittings and , respectively. The significances of the and are and , respectively. We find that the production of the and is not suppressed relative to the production of the , , and .
- Received 2 August 2011
DOI:https://doi.org/10.1103/PhysRevLett.108.032001
© 2012 American Physical Society