A Measurement of the electronic widths gamma (e e) of the upsilon (1s), upsilon (2s), and upsilon (4s) resonances, and of the total decay width Gamma of the upsilon (4s)

The partial decay width into electrons, Γee, of the ϒ(1S) and ϒ(2S) resonances have been measured with the detector ARGUS at thee+e− storage ring DORISII of DESY. Applying the formula of Kuraev and Fadin for the radiative corrections we find: Γee(ϒ(1S))= (1.32±0.04±0.03) keV and Γee(ϒ(2S))=(0.52±0.03±0.01) keV. The total decay width of the ϒ(4S) resonance and its partial width into electrons have been determined as well. Fitting the data with a generalized Breit-Wigner function with an energy dependent decay width Γ(s) and a mass shift functionm(s), we obtain the following resonance parameters: Γ(M2)=(10.0±2.8±2.7) MeV, Γee=(0.28±0.05±0.01)keV andBee=(2.77±0.50±0.49)·10−5. We argue that the disagrecment of this result with the world average originates from our more adequate parametrization of the observed ϒ(4S) resonance cross section.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
upsilon mesons: electroproduction
electroproduction: upsilon mesons
upsilon mesons: leptonic decay
leptonic decay: upsilon mesons
Upsilon(9460): width
Upsilon(10020): width

References(27)

Figures(0)

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