Di-electron Widths of the Upsilon(1S,2S,3S) Resonances

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  • 21 December 2005
Abstract
We determine the di-electron widths of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) resonances with better than 2% precision by integrating the cross-section of e+e- -> Upsilon over the e+e- center-of-mass energy. Using e+e- energy scans of the Upsilon resonances at the Cornell Electron Storage Ring and measuring Upsilon production with the CLEO detector, we find di-electron widths of 1.252 +- 0.004 (stat) +- 0.019 (syst) keV, 0.581 +- 0.004 +- 0.009 keV, and 0.413 +- 0.004 +- 0.006 keV for the Upsilon(1S), Upsilon(2S), and Upsilon(3S), respectively.

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