On QCD and $ω-ρ$ mixing

Details On QCD and $ω-ρ$ mixing On QCD and $ω-ρ$ mixing

1999-03-02

arxiv.org/abs/hep-ph/9903223v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, no figures, minor corrections

Scientific paper

The evaluation of sum rules and vacuum condensates used in the calculation of the mixing parameters of the $\omega -\rho$ system involve dangerous cancellations of large numbers. In this note the contribution of the continuum is eliminated in order to avoid such a large source of uncertainty. It is also seen that the hypothesis of vacuum saturation used in the estimate of the dimension 6 condensate is inadequate. The value obtained for the parameter $\beta$ which governs the off-shell variation of the $\omega -\rho$ mixing is $\beta=.25$.

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