Yang, JJ (reprint author), Acad Sinica, Inst High Energy Phys, POB 9184, Beijing 100039, Peoples R China.
Comparisons between the additional parton evolution (APE) model and Q(2)-rescaling (QR) model based on the recombination effect are made by means of investigating deep-inelastic (DIS) structure functions F-2(A), nuclear Drell-Yan process and nuclear gluon distributions. While explaining experimentally measured F-2(A)(x) structure functions, the difference in the recombination results of the two models mainly lies in their sensitivity to input parton distributions and Q(2)-dependence. In predicting the nuclear Drell-Yan ratio, the APE model gives more reasonable results in the small x region than those of the QR model. The two models offer similar predictions of the nuclear gluon ratio G(Sn)(x)/G(C)(x) which are extracted from the inelastic J/psi production process.