Measurement of the Direct Photon Spectrum in $Υ(1S)$ Decays

Details Measurement of the Direct Photon Spectrum in $Υ(1S)$ Decays Measurement of the Direct Photon Spectrum in $Υ(1S)$ Decays

1996-11-26

arxiv.org/abs/hep-ex/9611020v1

Phys.Rev.D55:5273-5281,1997

Physics

High Energy Physics

High Energy Physics - Experiment

20 page postscript file, postscript file also available through http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1103/PhysRevD.55.5273

Using data taken with the CLEO II detector at the Cornell Electron Storage Ring, we have determined the ratio of branching fractions: $R_{\gamma} \equiv \Gamma(\Upsilon(1S) \rightarrow \gamma gg)/\Gamma(\Upsilon(1S) \rightarrow ggg) = (2.75 \pm 0.04(stat.) \pm 0.15(syst.))%$. From this ratio, we have determined the QCD scale parameter $\Lambda_{\overline{MS}}$ (defined in the modified minimal subtraction scheme) to be $\Lambda_{\overline{MS}}= 233 \pm 11 \pm 59$ MeV, from which we determine a value for the strong coupling constant $\alpha_{s}(M_{\Upsilon(1S)}) = 0.163 \pm 0.002 \pm 0.014$, or $\alpha_{s}(M_{Z}) = 0.110 \pm 0.001 \pm 0.007$.

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