Abstract
We report a high-statistics measurement of the branching fraction for and the invariant mass spectrum of the produced system using of data recorded with the Belle detector at the KEKB asymmetric-energy collider. The branching fraction obtained is , where the first error is statistical and the second is systematic. The unfolded mass spectrum is used to determine resonance parameters for the , , and mesons. We also use this spectrum to estimate the hadronic () contribution to the anomalous magnetic moment of the muon (). Our result for integrated over the mass range is , where the first error is due to the experimental uncertainties, the second is due to the uncertainties in the branching fractions, and the third is due to the uncertainties in the isospin-violating corrections.
5 More- Received 26 May 2008
DOI:https://doi.org/10.1103/PhysRevD.78.072006
©2008 American Physical Society