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

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

2005-12-21

arxiv.org/abs/hep-ex/0512056v4

Phys.Rev.Lett.96:092003,2006

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 4 figures, also available through http://www.lns.cornell.edu/public/CLNS/2005/, published in PRL; corrected numeric

Scientific paper

10.1103/PhysRevLett.96.092003

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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