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

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

1998-09-01

arxiv.org/abs/hep-ph/9809224v2

Phys.Rev.D59:076002,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages (published version)

Scientific paper

10.1103/PhysRevD.59.076002

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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