Di-Electron Widths of the Υ (1S), Υ (2S), and Υ (3S) from the Cleo-Iii Detector

Details Di-Electron Widths of the Υ (1S), Υ (2S), and Υ (3S) from the Cleo-Iii Detector Di-Electron Widths of the Υ (1S), Υ (2S), and Υ (3S) from the Cleo-Iii Detector

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006fuin.conf..318p&link_type=abstract

FUNDAMENTAL INTERACTIONS. Proceedings of the 21st Lake Louise Winter Institute. Held 17-23 February 2006 in Lake Louise, Alberta

Physics

Scientific paper

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

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