Determination of Г ee of the Υ(1 S ) and Υ(2 S ) resonances, and measurement of R at W =9.39 GeV
1988
Using the Crystal Ball detector operating at the DORIS II storage ring we have measured the leptonic partial widthsГ
ee
of the Υ(1S) and Υ(2S) resonances. We find
$$\Gamma _{ee} (\Upsilon (1S)) = 1.34 \pm 0.03 \pm 0.06keV$$
and
$$\Gamma _{ee} (\Upsilon (2S)) = 0.56 \pm 0.04 \pm 0.02keV.$$
The effect onГ
ee
of applying different prescriptions for radiative corrections is discussed. We also measureR, the ratio of non-resonant hadronic cross section to the Born cross section of μ pair production, at c.m. energyW=9.39 GeV to beR=3.48±0.04±0.16.
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