Extracting Br(omega->pi^+ pi^-) from the Time-like Pion Form-factor
High Energy Physics - Phenomenology
2008-11-26 v2 Nuclear Theory
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%.
Cite
@article{arxiv.hep-ph/9809224,
title = {Extracting Br(omega->pi^+ pi^-) from the Time-like Pion Form-factor},
author = {S. Gardner and H. B. O'Connell},
journal= {arXiv preprint arXiv:hep-ph/9809224},
year = {2008}
}
Comments
12 pages (published version)