# Extracting Br(omega->pi^+ pi^-) from the Time-like Pion Form-factor

- Authors
- Type
- Published Article
- Publication Date
- Submission Date
- Identifiers
- DOI: 10.1103/PhysRevD.59.076002
- arXiv ID: hep-ph/9809224
- Source
- arXiv
- External links

## Abstract

We extract the G-parity-violating branching ratio Br(omega->pi^+ pi^-) from the effective rho-omega mixing matrix element Pi_{rho omega}(s), determined from e^+e^- -> pi^+ pi^- data. The omega->pi^+ pi^- partial width can be determined either from the time-like pion form factor or through the constraint that the mixed physical propagator D_{rho omega}^{mu nu}(s) possesses no poles. The two procedures are inequivalent in practice, and we show why the first is preferred, to find finally Br(omega->pi^+ pi^-) = 1.9 +/- 0.3%.