We determine the magnitude, phase, and s dependence of ρ-ω “mixing” in the pion form
factor in the timelike region through fits to e+ e−→ π+ π− data. The associated systematic
errors in these quantities, arising from the functional form used to fit the ρ resonance, are
small. The systematic errors in the ρ mass and width, however, are larger than previously
estimated.

We determine the magnitude, phase, and s-dependence of ρ-ω``mixing''in the pion form
factor in the time-like region through fits to e^+ e^-arrow π^+ π^-data. The associated
systematic errors in these quantities, arising from the functional form used to fit the ρ
resonance, are small. The systematic errors in the ρ mass and width, however, are larger
than previously estimated. Our paper, to appear in Physical Review D, is available on the
Web as< A HREF= http://xxx. lanl. gov/abs/hep-ph/9707385> hep-ph/9707385.