Di-electron widths of the Upsilon(1S,2S,3S) resonances

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.

Note:

9 pages postscript, 4 figures, also available through http://www.lns.cornell.edu/public/CLNS/2005/, submitted to PRL: further descriptions added, no changes in numerical values, smaller image file sizes Report-no: CLNS 05/1944, CLEO 05-30

14.40.Nd
12.20.Fv
13.25.Gv
Upsilon meson resonances
electron-positron interactions
electron positron: colliding beams
electron positron: annihilation
upsilon mesons: electroproduction
Upsilon(9460): width
Upsilon(10020): width

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