Christoph Pegel

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Using the Crystal BaII detect& operating at, the DORIS II storage ring we have measured the lept.onic partial widths Ice of the Y (1 S) and Y (25) resonances. We find I',,(Y(lS)) = 1.34 f 0.03 i 0.06 keV and I',,(T(2S)) = 0.56 IL 0.04 & 0.02 keV. The effect on I,, of applying different prescriptions for radiative corrections is discussed. We also measure R,(More)
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