Abstract
We determine the dielectron 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- energy scans of the Υ resonances at the Cornell Electron Storage Ring and measuring Υ production with the CLEO detector, we find dielectron widths of 1.252±0.004(σstat)±0.019(σsyst)keV, 0.581±0.004±0.009keV, and 0.413±0.004±0.006keV for the Υ(1S), Υ(2S), and Υ(3S), respectively.
Original language | English (US) |
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Article number | 092003 |
Journal | Physical review letters |
Volume | 96 |
Issue number | 9 |
DOIs | |
State | Published - 2006 |
Bibliographical note
Funding Information:This research was supported by NIH grants 2U24-CA083105-10 (JDG), P41RR08079 (AAS), and R01NS3867 (AAS). The authors thank Dr. Edwin M. Chance for inspiration and helpful discussion and David S. Nelson for assistance in preparing this manuscript.
Funding Information:
Acknowledgments This research was supported by NIH grants 2U24-CA083105-10 (JDG),