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

CLEO Collaboration·J. L. Rosner
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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 1.354 +- 0.004 (stat) +- 0.020 (syst) keV, 0.619 +- 0.004 +- 0.010 keV, and 0.446 +- 0.004 +- 0.007 keV for the Upsilon(1S), Upsilon(2S), and Upsilon(3S), respectively.

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CLEO Collaboration, J. L. Rosner. 2007-08-17. Di-electron Widths of the Upsilon(1S,2S,3S) Resonances. https://doi.org/10.1103/physrevlett.96.092003

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