The influence of nuclear target on 'small' mass lepton pair production of high energy hadron-nuclei collision

Based on Drell-Yan Mechanism modified by perturbative QCD and taking account of the contribution of vector meson states, we analyzed and explained the data of the WA-78 group ni (π-,p) + A →μ-μ+ + X process at 2 mμ < mμμ < 1.5 GeV and 0.1 < xF < 0.6, with the use of the rescaling model and the recent accurately measured data of the NMC Group for the ratio of structure functions RA(x,Q2) in 1-A deep inelastic scattering process at 0.0035 < x < 0.65 and 0.5 < Q2 < 90 GeV2/c2. In our analysis, after comparison with the data of the CIP group for the same process but at different m11-bar and xF regions, we gave a good explanation for why the influence of nuclear target displays a strong shadowing effect in former case while a strong anti shadowing effect in latter case. By the rescaling model and other reasonable assumptions, we showed it is intimately connected with the above mentioned the RA(x,Q2) and thus further revealing the essential connection for the influence