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Measurement of the direct photon spectrum in Y(1S) decays

Abstract:
Using data taken with the CLEO II detector at the Cornell Electron Storage Ring, we have determined the ratio of branching fractions: Rγ≡Γ(Y(1S)→γgg)/Γ(Y(1S)→ggg)=[2. 75±0.04(stat)±0.15(syst)]%. From this ratio, we have determined the QCD scale parameter ΛMS(defined in the modified minimal subtraction scheme) to be ΛMS=233±11±59 MeV, from which we determine a value for the strong coupling constant αs(MY(1S))=0.163±0.002±0.014, or αs(MZ)=0.110±0.001±0.007.
Publication status:
Published

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Publisher copy:
10.1103/PhysRevD.55.5273

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Journal:
Physical Review D More from this journal
Volume:
55
Issue:
9
Pages:
5273-5281
Publication date:
1997-05-01
DOI:
EISSN:
1089-4918
ISSN:
0556-2821
Pubs id:
pubs:21144
UUID:
uuid:8d4c64a0-9250-41db-876d-62d87c78e8ad
Local pid:
pubs:21144
Source identifiers:
21144
Deposit date:
2012-12-19

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