Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-08-29
Phys.Rev. D63 (2001) 034017; Erratum-ibid. D66 (2002) 079902
Physics
High Energy Physics
High Energy Physics - Phenomenology
Some typos in some equations are corrected. These typos do not affect the calculation and numerical results presented in the o
Scientific paper
10.1103/PhysRevD.63.034017
We perform a calculation on the polarization of J/psi production in deep inelastic scattering in the HERA energy range. For the inclusive production distributions, we find that the color-singlet contributions are consistent with the experimental data in the major region of z (z>0.4). Only in low z regions, there are some hints of the need of the color-octet contributions to describe the experimental data. For the polarization of J/psi in DIS processes, we find the parameter alpha changes with Q^2. Especially, at higher Q^2, difference on alpha between color-singlet and color-octet contributions become more distinctive. In the two regions of lower and larger z, the polarization parameter alpha have different features. These properties can provide important information on the polarization mechanism for J/psi production.
Chao Kuang-Ta
Yuan Fang-Fang
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