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DISTRIBUTION FOR 'CLUSTER' REFERENCE FRAME, I.E. FRAME MOVING WITH YRAP=0.08 ALONG BEAM.
We have observed decays of the ϒ(1S) into hadronic final states containing high-energy photons. These are interpreted as coming from the decay ϒ(1S)→γ+gluon+gluon. We compare the shape of the observed photon energy spectrum with several theoretical predictions and deduce the value of the strong-coupling constant αs and the QCD scale parameter ΛMS― (MS― denotes the modified minimal-subtraction scheme) associated with each prediction.
DATA TAKEN ON THE PEAK OF THE UPSI(9460).
DATA TAKEN ON THE PEAK OF THE UPSI(9460).
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Axis error includes +- 0.0/0.0 contribution (?////RES-DEF(RES=PHI,BACK=CORRECTED,DEF=/ < M( K+ K- ) < ? GEV)///EVENTS DUE TO REFLECTION FROM KS AND K*(892)0 WERE EXCLUDED).
Axis error includes +- 0.0/0.0 contribution (?////RES-DEF(RES=PHI,BACK=CORRECTED,DEF=/ < M( K+ K- ) < ? GEV)///EVENTS DUE TO REFLECTION FROM KS AND K*(892)0 WERE EXCLUDED).
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