Dielectron Widths of the $Υ (1 S, 2 S, 3 S)$ Resonances

We determine the dielectron widths of the

Υ (1 S)

Υ (2 S)

, and

Υ (3 S)

resonances with better than 2% precision by integrating the cross section of

e^{+} e^{-} \to Υ

over the

e^{+} e^{-}

center-of-mass energy. Using

e^{+} e^{-}

energy scans of the

Υ

resonances at the Cornell Electron Storage Ring and measuring

Υ

production with the CLEO detector, we find dielectron widths of

1.252 \pm 0.004 (σ_{stat}) \pm 0.019 (σ_{syst}) keV

0.581 \pm 0.004 \pm 0.009 keV

, and

0.413 \pm 0.004 \pm 0.006 keV

for the

Υ (1 S)

Υ (2 S)

, and

Υ (3 S)

, respectively.

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Dielectron Widths of theΥ(1S,2S,3S)Resonances