Actions for Measurement of the Direct Photon Spectrum in Upsilon (1S) Decays [electronic resource].

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Measurement of the Direct Photon Spectrum in Upsilon (1S) Decays [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2003.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
21 pages : digital, PDF file
Additional Creators
Stanford Linear Accelerator Center, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Using data taken with the CLEO II detector at the Cornell Electron Storage Ring, the authors have determined the ratio of branching fractions: R{sub γ} {triple_bond} Γ(Υ(1S) → γgg)/Γ(Υ(1S) → ggg) = (2.75 ± 0.04(stat.) ± 0.15(syst.))%. From this ratio, the authors have determined the QCD scale parameter Λ{sub {ovr MS}} (defined in the modified minimal subtraction scheme) to be Λ{sub {ovr MS}} = 233 ± 11 ± 59 MeV, from which they determine a value for the strong coupling constant α{sub s}(M{sub Υ(1S)}) = 0.163 ± 0.002 ± 0.014, or α{sub s}(M{sub Z}) = 0.110 ± 0.001 ± 0.007.
Report Numbers
E 1.99:slac-pub-9840
slac-pub-9840
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
05/16/2003.
"slac-pub-9840"
Jessop, Colin P.
Type of Report and Period Covered Note
Topical;
Funding Information
AC03-76SF00515
View MARC record | catkey: 14710085