Abstract
Using the ARGUS detector at thee + e − storage ring DORIS-II, we have observed the decays of γ(9,460) andΥ'(10,023) into muon pairs. The ratio of the two observed rates determines Bμμ(γ') largely independent of acceptance uncertainties and absolute luminosity calibration, ifB μμ(γ) is known. From data with an integrated luminosity of 6.11/pb on the γ and 9.93/pb on the γ, using the present world averageB μμ(γ)=(2.9±0.2)%, we obtainB μμ(γ)=(1.57±0.59±0.68)%.
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Supported by the Bundesministerium für Forschung und Technologie, ERG
Now at DESY
Supported by the Natural Sciences and Engineering Research Council, Canada
Supported by the U.S. National Science Foundation and a University of Kansas Faculty Improvement award
Now at CERN
Supported by the Swedish Research Council
Supported by the U.S. Department of Energy, under contract DE-AS09-80ER10690
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ARGUS Collaboration., Albrecht, H., Binder, U. et al. A determination of the muon pair branching ratio of the γ' meson. Z. Phys. C - Particles and Fields 28, 45–50 (1985). https://doi.org/10.1007/BF01550247
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DOI: https://doi.org/10.1007/BF01550247