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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Detalles Bibliográficos
Autores principales:	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:	1997

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

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