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Determination of color-octet matrix elements from e^+e- process at low energies

Feng Yuan·Cong-Feng Qiao·Kuang-Ta Chao
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Abstract

We present an analysis of the preliminary experimental data of direct j/psi production in e^e- process at low energies. We find that the color-octet contributions are crucially important to the cross section at this energy region, and their inclusion produces a good description of the data. By fitting to the data, we extract the individual values of two color-octet matrix elements: <{\cal O}_8^ψ(^1S_0)> \approx 1.1\times 10^{-2} GeV^3, <{\cal O}_8^ψ(^3P_0)> m_c^2\approx 7.4\times 10^{-3}GeV^3. We discuss the allowed range of the two matrix elements constrained by the theoretical uncertainties. We find that <{\cal O}_8^ψ(^1S_0)> is poorly determined because it is sensitive to the variation of the choice of m_c, α_s and <{\cal O}_1^ψ(^3S_1)>. However <{\cal O}_8^ψ(^3P_0)> m_c^2 is quite stable (about (6-9)\times 10^{-3}GeV^3) when the parameters vary in reasonable ranges. The uncertainties due to large experimental errors are also discussed.

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Feng Yuan, Cong-Feng Qiao, Kuang-Ta Chao. 1997-05-06. Determination of color-octet matrix elements from e^+e- process at low energies. https://doi.org/10.1103/physrevd.56.1663

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