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

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 subtracti...

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Detalhes bibliográficos
Principais autores:	Nemati, B, Richichi, S, Ross, W, Skubic, P, Wood, M, Bishai, M, Fast, J, Gerndt, E, Hinson, J, Menon, N, Miller, D, Shibata, E, Shipsey, I, Yurko, M, Gibbons, L, Johnson, S, Kwon, Y, Roberts, S, Thorndike, E, Jessop, C, Lingel, K, Marsiske, H, Perl, M, Schaffner, S, Ugolini, D
Formato:	Journal article
Publicado em:	1997

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

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