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

Authors
  • Gardner, S.
  • O'Connell, H. B.
Type
Published Article
Publication Date
Mar 04, 1999
Submission Date
Sep 01, 1998
Identifiers
DOI: 10.1103/PhysRevD.59.076002
arXiv ID: hep-ph/9809224
Source
arXiv
License
Unknown
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%.

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