Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-01-24
Phys.Rev. D56 (1997) 1663-1667
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 page, RevTex, 2 figures in postscript. To appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.56.1663
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^{\psi}(^1S_0)> \approx 1.1\times 10^{-2} GeV^3, <{\cal O}_8^{\psi}(^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^{\psi}(^1S_0)> is poorly determined because it is sensitive to the variation of the choice of m_c, \alpha_s and <{\cal O}_1^{\psi}(^3S_1)>. However <{\cal O}_8^{\psi}(^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.
Chao Kuang-Ta
Qiao Cong-Feng
Yuan Fang-Fang
No associations
LandOfFree
Determination of color-octet matrix elements from e^+e- process at low energies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Determination of color-octet matrix elements from e^+e- process at low energies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determination of color-octet matrix elements from e^+e- process at low energies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-88074